identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
03826143FF9A8178FF34FCCC114BFB46.text	03826143FF9A8178FF34FCCC114BFB46.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Amphora rhombica var. intermedia Cleve 1895	<div><p>Amphora rhombica var. intermedia Cleve Figs 1–6</p><p>Ref. illus.: Peragallo &amp; Peragallo 1897 –1908, pl. 50, fig. 3; Wachnicka &amp; Gaiser 2007, fig. 118; Stidolph et al. 2012, pl. 24, fig. 70; Álvarez-Blanco &amp; Blanco 2014, pl. 34, fig. 1.</p><p>Samples: GU43C</p><p>Dimensions: Length 62–110 µm, width 15–22 µm; dorsal and ventral striae 14–18 in 10 µm Diagnostics: Radiating striae of transapically elongate areolae; some central interstriae bifurcate toward the dorsal margin; no fascia; central area small; prominent conopeum both internally and externally. Dorsal margin slightly rhomboidal to uniformly curved, the ventral margin nearly straight to slightly arcuate, the raphe branches also nearly straight to slightly arcuate. Apices acute. Numerous copulae with areolae apparently on the pars interior not seen in external SEM view (Fig. 6).</p><p>Comments: Differences similar to those shown in the two LM specimens (Figs 1, 2 vs. 3, 4) can be seen in Peragallo &amp; Peragallo’s (1897 –1908) drawings, one of which is identified as var. intermedia; moreover, they noted differences from the original description of the nominate form, but chose not to erect another new variety. Further differences can be seen in size and striae counts of the Guam specimens and the range (for var. intermedia) in Wachnicka &amp; Geiser (2007); in particular our small specimens show no differences in stria density from center to apex nor between dorsal and ventral striae. The nominate variety is larger, distinctly semi-rhomboidal, has coarser striae (9–12 in 10 µm), and appears to lack the conopea (Schmidt et al. 1874–1959, pl. 40, fig. 39; Peragallo &amp; Peragallo 1897 –1908, Wachnicka &amp; Gaiser 2007). The very fine ventral striation (27 in 10 µm) on the specimen in Witkowski et al. (2000, pl. 168, fig. 12, 13) suggests yet another variety. A species in need of further study.</p><p>Common in a diatom coating on reef flat sand, very near low water, where it formed a community with A. decussata Grunow and an unidentified Amphora sp. among other genera.</p></div>	https://treatment.plazi.org/id/03826143FF9A8178FF34FCCC114BFB46	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9A817BFF34F93A1681FC8D.text	03826143FF9A817BFF34F93A1681FC8D.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Asteromphalus cleveanus Grunow 1876	<div><p>Asteromphalus cleveanus Grunow Fig. 7</p><p>ASTEROLAMPRALES Round &amp; Crawford: Asterolampraceae H.L. Smith.</p><p>Ref. illus.: Hernández-Becerril 1991, pl. 12, fig. 3</p><p>Samples: GU52N-4</p><p>Dimensions: Length 42 µm, width 33 µm, areolae 16 in 10 µm in the middle of the segment.</p><p>Diagnostics: One singular ray reaching the center, 9 ordinary rays around it (i.e., 10 segments), the segments attached to the central area by long costae; small areolae.</p><p>Comments: Record based on one broken LM view found in a turf sample from farmer fish territory but presumably redeposited from the plankton. The shape of the valve and the number of rays distinguishes this species from A. flabellatus (Brébisson) Greville (Hustedt 1927 –1930, fig. 279; Hernández-Becerril 1991, pl. 12, figs 1, 2).</p></div>	https://treatment.plazi.org/id/03826143FF9A817BFF34F93A1681FC8D	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF99817BFF34FE4210D3FE18.text	03826143FF99817BFF34FE4210D3FE18.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Asteromphalus hepactis (de Brebisson) Ralfs	<div><p>Asteromphalus hepactis (de Brébisson) Ralfs Figs 8, 9</p><p>Ref. illus.: Hustedt 1927 –1930, fig. 277; Cupp 1943, fig. 32; Hendey 1964, pl. 24, fig. 5; Hernández-Becerril 1991, pl. 28, 29</p><p>Samples: GU56A-2, GU52N-4</p><p>Dimensions: Length 51 µm, width 47 µm, areolae 5.5 in 10 µm</p><p>Diagnostics: One singular ray reaching the center, 6 wide ordinary rays around it (i.e., 7 segments), large areolae.</p><p>Comments: Record based on one internal SEM view; the high mantle, shown in HernándezBecerril’s (1991) images is not evident in the vertical image, but the specimen is otherwise consistent with those images and Hustedt’s (1927 –1930) drawing and description.</p></div>	https://treatment.plazi.org/id/03826143FF99817BFF34FE4210D3FE18	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF99817BFF34FCCF1173F9E0.text	03826143FF99817BFF34FCCF1173F9E0.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Auricula flabelliformis Voigt	<div><p>Auricula flabelliformis Voigt Figs 10–12</p><p>Syn.: A. machutchoniae Giffen (1970b)</p><p>Ref. illus.: Voigt 1960, pl. 1, figs 8, 9; Ricard 1977, pl. 8, fig. 2; Ricard 1987, fig. 942</p><p>Samples: Guam: GU66A-2; Yap: Y26B</p><p>Dimensions: Length 92–95 µm, width 64–67 µm, striae ca. 19 in 10 µm; fibulae ca. 8 in 10 µm.</p><p>Diagnostics: Large, broadly reniform valve, dorsal margin (defined by the raphe-keel) forming&gt;90% of the circumference, indented from the valve margin before the ventral ends; ventral margin very short, straight. Striation flabellate, arising along a poorly defined median line.</p><p>Comments: Observed so far as only a single SEM specimen from Guam and an LM specimen from Yap. Voigt named three varieties besides the type in which the pattern of striae along the median axis ranged from flabelliform to distichous ( var. hustedtii), the latter based on Meister’s (1932, pl. 10, fig. 67) Hustedtia mirabilis, now Auricula mirabilis (Meister) Paddock &amp; Sims (1980) .</p></div>	https://treatment.plazi.org/id/03826143FF99817BFF34FCCF1173F9E0	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF99817AFF34FA94151CFC73.text	03826143FF99817AFF34FA94151CFC73.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Campylodiscus fastuosus Ehrenberg 1845	<div><p>Campylodiscus fastuosus Ehrenberg Figs 13, 14, 16, 18–20</p><p>Syn: Campylodiscus thuretii Brébisson</p><p>C. simulans Gregory</p><p>Ref. illus: Peragallo &amp; Peragallo 1897 –1908, pl. 57, figs 4–9 (as C. thuretii); Choi &amp; Noh 1987, figs 73–76; Guettinger 1989 2.09.01-1; López Fuerte et al. 2010, pl. 39, figs 10, 11 (as C. simulans); Stidolph et al. 2012, pl. 21, fig. 14 and pl. 6, fig. 132 (the latter as C. thuretii)</p><p>Samples: GU66F-7A, GU66F-8, GU52Q-10a, GU52Q-2, GY44Y-13</p><p>Dimensions: 16–34 µm diam., central striae 14 in 10 µm</p><p>Diagnostics: Circular valves with two parallel lines of short striae along the apical axis. Small valves similar to Surirella scalaris Giffen (Figs 15, 17) (Lobban et al. 2012, pl. 68, figs 5, 6; pl. 69, figs 1, 2), but differing in the marked narrowing of the infundibula such that the spaces between them become wider and with a single prominent rib reaching the central area, whereas in S. scalaris the infundibula taper only a little and leave a uniform space between them, without a prominent rib. Both have several spiny ridges over the infundibula on both sides of the raphe; those of C. fastuosus are less spiny in comparison.</p><p>Comments: The difference is hard to see in small specimens in LM, and we needed complete frustules (Figs 16, 18) before being sure about C. fastuosus, which commonly co-occurred with S. scalaris in these Guam samples from farmer-fish territories. The LM image published in Lobban et al. 2012, pl. 68, fig. 4 as Surirella scalaris is in fact C. fastuosus and a true image is shown here in Fig. 15 for comparison. This has been corrected on the web page. See VanLandingham (1968) for synonymies.</p></div>	https://treatment.plazi.org/id/03826143FF99817AFF34FA94151CFC73	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF98817AFF34FEE91030FF63.text	03826143FF98817AFF34FEE91030FF63.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Cocconeis dapalistriata Riaux-Gobin, Romero, Compere & Al-Handel	<div><p>Cocconeis dapalistriata Riaux-Gobin, Romero, Compère &amp; Al-Handel Fig. 21</p><p>Ref. illus.: Riaux Gobin et al., 2011, pl. 3, figs 6–8, pls 39, 40.</p><p>Samples: GU44AU-2</p><p>Dimensions: Length ca. 17 µm, width 10 µm, striae ca 10 in 10 µm</p><p>Diagnostics: Distinctive striae pattern; the epithet dapalis, sumptuous, refers to the “remarkable and magnificent SV striation” (Riaux-Gobin et al. 2011, p. 25).</p><p>Comments: Included so far on the basis of a single sternum valve in SEM.</p></div>	https://treatment.plazi.org/id/03826143FF98817AFF34FEE91030FF63	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF98817AFF34FD1916B1FEED.text	03826143FF98817AFF34FD1916B1FEED.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Cocconeis ornata W. Gregory	<div><p>Cocconeis ornata W. Gregory Figs 22–26</p><p>Ref. illus.: Gregory 1857, pl. IX (1), fig. 24; Peragallo &amp; Peragallo 1897 –1908, pl. 4, figs 13–15; Montgomery 1978, pl. 61, figs A–D; Riaux-Gobin et al. 2014, figs 9–14</p><p>Samples: GU44AU-2</p><p>Dimensions: Length 19 µm, width 15 µm, striae ca 10 in 10 µm</p><p>Diagnostics: SV: striae coarsely uniseriate but sometimes branching towards the margin, striae interrupted by a longitudinal hyaline line; margin with parallel rows of papillae. RV not seen.</p><p>Comments: A few specimens in this sample. Gregory (1857) was charmed by the “rich ornate aspect” of this “beautiful” species, which does indeed appear ornate, especially in SEM (Fig. 27). The original drawing did not do it justice.</p></div>	https://treatment.plazi.org/id/03826143FF98817AFF34FD1916B1FEED	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF98817AFF34FC621519FB6A.text	03826143FF98817AFF34FC621519FB6A.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Cocconeis subtilissima Meister 1934	<div><p>Cocconeis subtilissima Meister Figs 27–32</p><p>Ref. illus.: De Stefano &amp; Romero 2005, pl. 32, figs 1–9, pl. 33, figs 1–11; Suzuki et al. 2008, figs. 1–41; Riaux-Gobin et al. 2011, pl. 6, figs 3–11, pl. 73, 74</p><p>Samples: GU44I-2, GU44Z-15, GU44AC-4, GU44AQ-1, GU52P-8</p><p>Dimensions: Length 16–22 µm, width 11–15 µm, striae (SV) 30 in 10 µm, (RV) 32 in 10 µm Diagnostics: RV (Figs 29, 30) with sigmoid raphe branches, a small hyaline area beyond the terminal raphe endings; central area small, asymmetrical; internal central raphe endings deflect past each other and come to a point. SV alveolate (Figs 31, 32) with slit-like striae divided by a single longitudinal hyaline line; internally a single row of areolae opens from the inner line of alveoli and the other alveolae open via a ring of areolae around the margin.</p><p>Comments: De Stefano &amp; Romero (2005) placed this species and others with such alveolate walls (e.g., C. convexa Giffen and C. heteroidea Meister in our flora) in a new section Alveolatae . They also provided tables comparing the alveolate taxa. De Stefano &amp; Romero (2005) distinguish C. subtilissima from several species, especially C. pseudomarginata Gregory, by the denser striae. The RV of C. subtilissima is similar to that of C. krammeri (see especially Witkowski et al. 2000, pl. 33, figs 1–4, pl. 42, fig. 34), but the stria density is slightly lower, 23–28 striae in 10 µm; on SV of C. krammeri there are 2 longitudinal hyaline lines creating three sets of areolae on each side of the sternum.</p></div>	https://treatment.plazi.org/id/03826143FF98817AFF34FC621519FB6A	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF98817DFF34F9E11643F820.text	03826143FF98817DFF34F9E11643F820.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Colliculoamphora gabgabensis Lobban 2015	<div><p>Colliculoamphora gabgabensis Lobban, n. sp. Figs 33–40</p><p>EUNOTIALES Silva: Eunotiaceae Kützing</p><p>Samples: GU44K-6; GU44I-1, GU44Z-15, GU44W-10, GU44U-1B, GU44AK-6, GU66F-4, GU66F-8</p><p>Dimensions: Length 6.4–11 µm, width 2.8–4.2 µm, striae 25–27 in 10 µm in the middle, denser around the apices.</p><p>Diagnosis: Differing from other Colliculoamphora species in the smaller size, finer striae, and markedly concave dorsal margin; dorsal striae interrupted by longitudinal hyaline area.</p><p>Holotype: GU44AK-6, slide 958, Fig. 33. Deposited at California Academy of Sciences (CAS), accession # 627425, slide # 223041.</p><p>Paratypes: A specimen (Fig. 35) is marked on GU44I-1, slide 494, CAS accession # 627427, slide # 220343, in addition to the holotype of Lauderia excentrica, and the specimen in Fig. 29 from GU44Z-15 is on a stub deposited at CAS, accession # 627385.</p><p>Type locality: <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=144.64285&amp;materialsCitation.latitude=13.442675" title="Search Plazi for locations around (long 144.64285/lat 13.442675)">GabGab</a> reef, Apra Harbor Guam, 13°26′ 33.63′′ N 144° 38′ 34.25′′ E, associated with filamentous algal turf in a farmer-fish territory, collected by C. Lobban &amp; M. Schefter, 5 Nov. 2011 .</p><p>Etymology: named for the type location, which in turn is a Chamorro name for the coral tree ( Erythrina variegata L.).</p><p>Description: Valves linear, asymmetrical about the apical plane, dorsal margin curved, more or less strongly concave, ventral margin slightly bent. Raphe visible on the valve face at each pole but lying mostly on the mantle (Figs 36, 37). Striae on the dorsal side interrupted by an irregular, apparently depressed hyaline area (Figs 36, 37); striae parallel on the proximal side of this area, but on the distal side parallel only in the middle, becoming radiate around the poles, where they also become denser from the interpolation of additional short striae along the margin (Figs 37, 38). Single row of more closely-spaced pores on the ventral side of the raphe (Fig. 38). Copulae areolate (Fig. 40). Valve surface smooth, not colliculated (i.e., lacking small elevations).</p><p>Comments: Present in low numbers in several samples and probably overlooked in others. Colliculoamphora was established by Williams &amp; Reid (2006) for two species formerly placed in Amphora . They noted the similarity to Eunotia, from the way the raphe hooks off the valve face onto the mantle, and placed it in Eunotiaceae . Williams &amp; Reid (2009) gave a comprehensive list of the ten known species of Colliculoamphora, noted the paucity of material for all species, and rationalized the description of new species on such data as they had, an argument I applaud. Most species have straight or convex dorsal margins but three have concave dorsal margins. Of the latter, C. palawanensis G. Reid &amp; D.M. Williams (Williams &amp; Reid 2009, figs 15, 17–21) most closely resembles our species, in having a central hyaline area the length of the valve and the closest shape, but it is larger (14–17 x 4–5 µm) and the striae coarser (18–19 in 10 µm). Indeed, our species is smaller and the striae denser than any in Williams &amp; Reid’s (2009) list. No external SEM was given for C. palawanensis .</p></div>	https://treatment.plazi.org/id/03826143FF98817DFF34F9E11643F820	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9F817CFF34FAD71018FC51.text	03826143FF9F817CFF34FAD71018FC51.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Hemidiscus cuneiformis var. ventricosa (Castracane) Hustedt 1930	<div><p>Hemidiscus cuneiformis var. ventricosa (Castracane) Hustedt Figs 41, 42</p><p>COSCINODISCALES Round &amp; Crawford: Hemidiscaceae Hendey</p><p>Ref. illus.: Hustedt 1927 –1930, fig. 542d; Hendey 1964, pl. 22, fig. 9; Ricard 1987, figs 30–34; Stidolph et al. 2012, pl. 13, fig. 71 and pl. 4, figs 104, 107; Álvarez-Blanco &amp; Blanco 2014, pl. 11, fig. 6; the images in Round et al. 1990, pp. 192–193, are also evidently this species.</p><p>Samples: GU66F-4</p><p>Dimensions: long axis 71–74 µm, short axis 41–45 µm</p><p>Diagnostics: Distinctively shaped, lens-shaped in valve view but the frustules wedge-shaped (cuneiform) because the valve faces are at an angle to one another. Areola pattern similar to Actinocyclus, to which it is related, but with a series of radiating patterns around the margin, especially on the less strongly curved side. Large rimoportulae visible in the oblique view (Fig. 42). A pseudonodulus is present on the flatter side (Fig. 41).</p><p>Comments: Two valves observed in one sample. The ventral curvatures of H. cuneiformis Wallich vary from straight to sinuous and Hustedt combined several older Eudotia species as varieties. Images shown by Hendey (1964), Stidolph et al. (2012, pl. 13, fig. 71) and identified simply as H. cuneiformis Wallich, have a ventral outline as shown here; Hendey did not comment on varieties; Stidolph et al. (2012, pl. 10, fig. 30) show the nominate variety, again without noting the variety. The species differs further in valve shape from two fossil species (Harwood &amp; Maruyama 1992). Although Round et al. (1990) (reprinted in AlgaeBase) said that the valves are cuneiform, it seems to me that Wallich’s (1860) epithet refers to the shape of the frustule (described by Round et al. 1990 as “shaped like orange segments”), rather than to the shape of the valve.</p></div>	https://treatment.plazi.org/id/03826143FF9F817CFF34FAD71018FC51	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9E817CFF34FE0717D1FB6E.text	03826143FF9E817CFF34FE0717D1FB6E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Lauderia excentrica Lobban 2015	<div><p>Lauderia excentrica Lobban, n. sp. Figs 43–48</p><p>THALASSIOSIRALES Glezer &amp; Makarova: Lauderiaceae (Schütt) Lemmermann, emend. F.E. Round &amp; R.M. Crawford</p><p>Samples: GU44I-1, GU44Y-13, GU55B-4, GU66A-3</p><p>Dimensions: Diameter 23–26 µm.</p><p>Diagnosis: Differing from L. annulata in the larger, reniform, excentric annulus, in the more numerous fultoportulae over the valve face and mantle, and in lacking a ring of longer spines.</p><p>Holotype: GU44I-1, slide 494, deposited at California Academy of Sciences, accession # 627427, slide # 220343. Fig. 43.</p><p><a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=144.64285&amp;materialsCitation.latitude=13.442675" title="Search Plazi for locations around (long 144.64285/lat 13.442675)">Type</a> location: GabGab reef, Apra Harbor Guam, 13°26′ 33.63′′ N 144° 38′ 34.25′′ E, associated with filamentous algal turf in a farmer-fish territory, collected by C. Lobban &amp; M. Schefter, 29 Oct. 2007 .</p><p>Etymology: with reference to the excentric annulus.</p><p>Description: An asymmetrically placed reniform central area is defined by a hyaline ring from which radiate numerous hyaline veins (“costae”); on the wider side some of these branch dichotomously (Figs 43, 44). Punctae scattered in the central area and usually biseriate between the veins (Figs 44, 45). Fultoportulae scattered in the central area and occurring along the veins over much of the valve face although less frequent in a zone around the central area (Figs 44, 45). Spines absent. Numerous fultoportulae on the margin, where anastomosing costae form a “loculate” pattern, as in L. annulata (Figs 44, 47). One large rimoportula at the edge of the valve furthest from the central area, with a simple circular opening externally (Fig. 44) and a large labiate process internally (Figs 46, 48). Fultoportulae in the outer zone are mostly on the veins, whereas those in the zone around the central area are mostly between veins. Fultoportulae consist of a slightly flared external tube 0.5 µm high and a much shorter internal tube (visible on the mantle in Fig. 48); fultoportulae within the annulus generally had no 5 satellite pores, those in the striae had 2–4 (Fig. 48). Valves do not appear to be delicate.</p><p>Comments: All previously reported taxa were synonymized by Hasle (1974) into L. annulata Cleve, and Round et al. (1990) placed it in its own family. It forms delicate chains in the plankton (Ricard 1987, figs 140, 147). The ultrastructure of the valve was shown by Hasle (1974, figs 1–3, 6–12), Syvertsen &amp; Hasle (1982), Round et al. (1990, pp. 150–151) Güttinger (1994), and Al-Kandari et al. (2009, pl. 5A, B). Hasle (1974) gives the range of valve diameters as 24–75 µm; the new species is at the lowest end of this range. The present species has not been seen alive, and is represented so far only by a few valves from sites both inside the harbor and on the outer coast. It was perhaps deposited from the water column but the valves seem relatively sturdy, unlike L. annulata, and it may be benthic [cf. Roundia cardiophora (Round) Makarova in our flora]. This species is significant in adding a second taxon to this family.</p></div>	https://treatment.plazi.org/id/03826143FF9E817CFF34FE0717D1FB6E	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9E817FFF34F9E515F3FCEC.text	03826143FF9E817FFF34F9E515F3FCEC.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia affirmata (Leuduger-Fortmorel) Cleve 1892	<div><p>Mastogloia affirmata (Leuduger-Fortmorel) Cleve Figs 49, 50</p><p>Section: Undulatae</p><p>Ref. illus.: Hustedt 1931 –1959, fig. 962.</p><p>Samples: GU44AX-1</p><p>Dimensions: Length 39 µm; width 22 µm; transapical striae 14 in 10 µm, longitudinal striae 10 in 10 µm except for the wider row adjacent to axial area; partecta 3.3 µm wide, 13 in 10 µm.</p><p>Diagnostics: Coarsely areolate, those along the raphe notably elongated; apices produced; longitudinal ribs almost straight; partectae very narrowly rectangular.</p><p>Comments: Distinguished from the very similar M. bahamensis Cleve (Hustedt 1931 –1957, fig 963, Hein et al. 2008, pl. 34, fig. 6 and pl. 36, fig. 10), which has irregularly wavy longitudinal ribs, according to Hustedt, and from M. subaffirmata Hustedt (see below) by the much coarser striae. Record based on a single specimen from Guam, but also seen in samples from Yap (unpublished).</p></div>	https://treatment.plazi.org/id/03826143FF9E817FFF34F9E515F3FCEC	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9D817FFF34FE60168BF92C.text	03826143FF9D817FFF34FE60168BF92C.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia emarginata Hustedt 1925	<div><p>Mastogloia emarginata Hustedt Figs 51–55</p><p>Section: Ellipticae</p><p>Ref. illus.: Hustedt 1931 –1959, fig. 896; Pennesi et al. 2013, figs 65, 66 (lectotype specimen) Samples: GU44R-2, GU44AU-1; GU53E-2; GU66F-4; GU55B-4</p><p>Dimensions: Length 18–20 µm; width 9–13 µm; striae 20–23 in 10 µm; partecta 2 in 10 µm.</p><p>Diagnostics: Small oval valves with 3–4 concave partecta on each side, reaching the apex, pore on the outer side of each partectum distinctively visible in LM (Fig. 54, arrows). Longitudinal striae nearly straight, coarser than the transapical striae, resulting in rectangular areolae.</p><p>Comments: Differs from M. ovulum Hustedt, which has finer, circular areolae, and partectal pores that are not evident in LM. As noted in the errata to Lobban et al. (2012), the specimen given there in pl. 33, figs 9, 10 for M. ovulum was misidentified and is given here correctly as M. emarginata; the specimen of M. ovulum posted on the web in its place is printed here as Figs 56, 57; see Jordan et al. 2009 –2015, /taxa_id/585541, for SEM images of M. ovulum . Besides the unique pores, M. emarginata differs from M. ovalis A. Schmidt in having partecta reaching the apex and from M. matthaei (see below) and M. stellae (Pennesi et al. 2013, figs 45–52, 57–60) in the number of partecta as well as characters of the areolae.</p></div>	https://treatment.plazi.org/id/03826143FF9D817FFF34FE60168BF92C	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9D817FFF34FBA315D1FB0E.text	03826143FF9D817FFF34FBA315D1FB0E.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia matthaei Pennesi & Poulin	<div><p>Mastogloia matthaei Pennesi &amp; Poulin Figs 58–61</p><p>Section: Ellipticae</p><p>Ref. illus.: Pennesi et al. 2013, figs 37–44, 53–56</p><p>Samples: GU52P-2</p><p>Dimensions: Length 14–15 µm; width 9 µm; striae 24–27 in 10 µm.</p><p>Diagnostics: Small oval valves with 3 concave/bilobed partecta on each side, reaching the apex. Quadrangular areolae in irregular longitudinal striae; internal areolae in longitudinal rows (not seen yet in Guam specimens).</p><p>Comments: Very similar to M. ovulum Hustedt, M. emarginata Hustedt and M. stellae Pennesi &amp; Poulin in size and shape of the valve and the bilobed partecta. Differs in the shape and arrangement of the areolae from M. ovulum (Figs 56, 57), which has apically elongate areolae tending to form an irregular quincunx pattern and internal areolae not in longitudinal rows (Pennesi et al. 2013, table 1). Distinguished from M. emarginata (see above) in lacking the evident partectal pores and from M. stellae in the striae pattern and shape of the areolae (rectangular and sunken in contrast to round and flush).</p></div>	https://treatment.plazi.org/id/03826143FF9D817FFF34FBA315D1FB0E	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9D817EFF34F9C2158CFC8D.text	03826143FF9D817EFF34F9C2158CFC8D.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia obliqua Hagelstein 1939	<div><p>Mastogloia obliqua Hagelstein Figs 62, 63</p><p>Ref. illus.: Hagelstein 1939, pl. 5, figs 12, 13; Giffen 1980, pl. 2, figs 23, 23a, 24; Loir &amp; Novarino 2013, pl. 16c</p><p>Samples: GU66F-4</p><p>Dimensions: Length 13 µm, width 4.4 µm, striae ca. 25 in 10 µm.</p><p>Diagnostics: Small, rostrate valves with one partectum on each side (sometimes two, as shown by Hagelstein 1939), placed slightly obliquely across the central area.</p><p>Comments: Comparable with M. tenuis Hustedt (Lobban et al. 2012, pl. 37, figs 6–8), which is not rostrate, has finer striae, and has two small tapering partecta bordering the larger partecta on each side, the chambers symmetrically placed (as in most Mastogloia spp.) and also has axial costae bordering the internal raphe-sternum. Also similar to M. giekesii Cholnoky (Loir &amp; Novarino 2013, pl. 13a), which is rostrate, has two chambers on each side (apparently never only one), symmetrically placed.</p></div>	https://treatment.plazi.org/id/03826143FF9D817EFF34F9C2158CFC8D	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9C817EFF34FE421145F90C.text	03826143FF9C817EFF34FE421145F90C.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia peracuta Janisch 1893	<div><p>Mastogloia peracuta Janisch Figs 64–67</p><p>Section Decussatae</p><p>Ref. illus.: Hustedt 1931 –1959, fig. 906; Ricard 1974, pl. 4(22), fig. 12; Montgomery 1978, pl. 132, figs E, F (as Mastogloia rhomlus [sic] (Petit) Cleve); Navarro 1983a, figs 52, 53; Yohn &amp; Gibson 1992, figs 1–6; Hein et al. 2008, pl. 43, fig. 1; Loir &amp; Novarino 2013, pl. 18a</p><p>Samples: GU44AP-9</p><p>Dimensions: Length 27–29 µm, width 14–16 µm; striae 17 in 10 µm.</p><p>Diagnostics: Rostrate valves with coarse, transapically elongate areolae in decussate pattern, with a band of smaller, square areolae along the margin. Raphe straight, central endings close together.</p><p>Comments: Our specimens do not entirely agree with Hustedt’s (1931 –1959) description, especially that the transapical length of their areolae does not gradually increase from the raphe to the margin and that the apical partecta, while wider than the others, are not twice the width. Nevertheless, it does match more recent descriptions and SEM observations (Yohn &amp; Gibson 1982, Loir &amp; Novarino 2013), with the exception of the external appearance of the areolae depicted by Paddock &amp; Kemp (1990, fig. 44). Hustedt (1931 –1959) contrasted it with the very similar M. rhombus (Petit) Cleve &amp; Grove. In our flora it resembles M. lacrimata Voigt (Lobban et al. 2012, pl. 30, figs 6–8) in the large, decussate pattern of transapically elongate areolae, though in the latter the transapical striae are noticeably curved, and the partectal chambers readily distinguish it.</p></div>	https://treatment.plazi.org/id/03826143FF9C817EFF34FE421145F90C	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9C817EFF34FBC3115AFBAD.text	03826143FF9C817EFF34FBC3115AFBAD.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia pumila (Grunow) Cleve	<div><p>Mastogloia cf. pumila (Grunow) Cleve Figs 68–72</p><p>Section Sulcatae</p><p>Ref. illus.: Hustedt 1931 –1959, fig. 983; Witkowski et al. 2000, pl. 83, figs 5, 6; Loir &amp; Novarino 2013, pl. 19c</p><p>Sample: GU52P-1, GU52P-9</p><p>Dimensions: Length 10–17 µm, width 5.5–6.5 µm; striae 27 in 10 µm, radiate</p><p>Diagnostics: Small valves, elliptical-lanceolate with slightly rostrate apices; central area extended into an H-shaped hyaline area. In our small cells, 1–2 large partecta in the middle flanked by 1–2 tapering partecta on each side and the H-shaped hyaline area is not evident externally.</p><p>Comments: These small specimens have chambers much like M. sergiana Pennesi &amp; Poulin (Lobban et al. 2012, pl. 36, figs 7, 8 and pl. 37 figs 1, 2), M. manokwariensis Cholnoky (Lobban et al. 2012, pl. 32, figs 1–3), M. pusilla var. subcapitata Hustedt (Hustedt 1931 –1959, fig 1002e, Loir &amp; Novarino 2013, pl. 20b), and M. urveae Witkowski, Lange-Bertalot &amp; Metzeltin (Witkowski et al. 2000, pl. 84, figs 22, 23, Loir &amp; Novarino 2013, pl. 24a, 27b). However, the elliptical valve outline and the distinct lyrate hyaline area distinguish it from each of these. M. urveae also differs in having parallel striae (Witkowski et al. 2000). Larger size ranges for M. pumilla were given by Hustedt (1931 –1959) (20–20 x 5–9 µm) and Loir &amp; Novarino (2013) (17.5–25 x 6.5–7.5 µm).</p></div>	https://treatment.plazi.org/id/03826143FF9C817EFF34FBC3115AFBAD	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF9C8171FF34F9221744FF43.text	03826143FF9C8171FF34F9221744FF43.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia quinquecostata Grunow	<div><p>Mastogloia quinquecostata Grunow Figs 73–79</p><p>Section Sulcatae .</p><p>Ref. illus.: Peragallo &amp; Peragallo 1897 –1908, pl. 6, fig. 3; Hustedt 1931 –1959, fig. 989; Ricard 1974, p. 3(21), fig. 7; Ricard 1975, figs 32–35; Paddock &amp; Kemp 1990, fig. 20c; Witkowski et al. 2000, pl. 80, figs 7, 8</p><p>Samples: GU44I-2, GU44K-6, GU52Q-10a, GU66A-5, GU66F-8</p><p>Dimensions: Length 30–58 µm, width 14–19 µm; striae 22–24 in 10 µm</p><p>Diagnostics: Elliptical-lanceolate to rhombic-lanceolate valves with strong longitudinal lines and narrow partectal rings with square to apically rectangular partecta. Outer raphe is strongly sinuous and the inner straight; central endings straight.</p><p>Comments: The species name refers to the strong longitudinal lines, which mark the borders of the pseudoconopeum; a thin dark line marking the joint in the pseudoconopeum can sometimes be seen in LM and is clear in SEM (Figs 77, 78, arrows). Our stria densities are higher than those in Peragallo &amp; Peragallo (1897 –1908) (15–16 in 10 µm) and Hustedt (1931 –1959) (16–20 in 10 µm). Montgomery (1978, pl. 138, figs A–E, pl. 139, figs C, D) has exterior SEMs labeled as M. quinquecostata, but they all show specimens with true conopea, open along the side, in contrast to Paddock &amp; Kemp’s (1990) illustration. The partecta shown in Witkowski et al. (2000) do not match those in Hustedt’s (1931 –1956) drawings.</p></div>	https://treatment.plazi.org/id/03826143FF9C8171FF34F9221744FF43	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF938171FF34FD381524F820.text	03826143FF938171FF34FD381524F820.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Mastogloia seychellensis Grunow 1878	<div><p>Mastogloia seychellensis Grunow Figs 80–82</p><p>Section Paradoxae</p><p>Ref. illus.: Hustedt 1931 –1959, fig. 958; Loir &amp; Novarino 2013, pl. 21c</p><p>Samples: GU52Q-10a</p><p>Dimensions: Length 45–48 µm, width 13 µm; transapical striae 27 in 10 µm, longitudinal striae 26 in 10 µm.</p><p>Diagnostics: Elliptical-lanceolate valves with rostrate apices, the partecta strongly displaced toward the midline and with evident ducts leading obliquely to the valvocopula wall.</p><p>Comments: M. seychellensis is similar to M. paradoxa Grunow (Hustedt 1931 –1959, fig. 953; in our flora: Lobban et al. 2012, pl. 34, figs 3–5) and M. similis Hustedt (Hustedt 1931 –1959, fig. 954); the latter differs from M. paradoxa only in having a straight raphe. In these taxa the middle chambers are distinctly larger than the rest, instead of forming a graded series as in M. seychellensis, and both have axial costae along the raphe, which are absent from M. seychellensis . The size ranges of M. seychellensis and M. paradoxa are respectively 30–50 µm and 50–60 µm according to Hustedt. Although Hustedt showed the raphe of M. seychellensis as perfectly straight, the Guam specimens have a distinctly wavy raphe. On the strength of the difference Hustedt (1931 –1959) used to erect M. similis, this would be enough to exclude these specimens from M. seychellensis but we do not yet have adequate material to address the differences among these species.</p></div>	https://treatment.plazi.org/id/03826143FF938171FF34FD381524F820	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF938170FF34FAD71503FFA2.text	03826143FF938170FF34FAD71503FFA2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Nitzschia janischii Grunow 1880	<div><p>Nitzschia janischii Grunow Figs 83–88</p><p>Ref. illus.: Grunow 1880, pl. 13, fig. 14; Peragallo &amp; Peragallo 1897 –1908, pl. 76, fig. 14</p><p>Samples: GU44Z-15, GU44AK-2, GU44AR-2</p><p>Dimensions: Length 225–275 µm, width 7–9 µm; striae 23 in 10 µm; fibulae 4 in 10 µm Diagnostics: Extremely long valves with irregularly spaced fibulae extending completely across the valve face. Central nodule present (Fig. 86). Areolae arranged in quincunx pattern of transapical and diagonal striae. Fourteen large, platelike plastids observed, with large pyrenoids (Fig. 83).</p><p>Comments: N. janischii is most similar to Tryblionella scalaris (Ehrenberg) Siver &amp; Hamilton [= N. scalaris (Ehrenberg) W. Smith] (Ruck &amp; Kociloek 2004, pl. 62–65), but that primarily freshwater/brackish species has ribs that extend only halfway across the valve face, besides the characters that make it Tryblionella . N. janischii was not recorded from The Bahamas (Hein et al. 2008), Puerto Rico (Hagelstein 1939, Navarro 1983b), Mahé (Giffen 1980), or Tahiti (Ricard 1977), and we are aware of no record other than Grunow’s. No ultrastructure images are cited in Gaul et al. (1993) or Henderson &amp; Reimer (2003). Grunow (1880) illustrated only half of a specimen from the Hawaiian Islands, where it was “rare,” but Peragallo &amp; Peragallo (1897 –1908) drew a whole valve; it is not clear whether they saw Grunow’s specimen, as they mention it only as a “curious exotic form,” perhaps not in the French flora. Grunow placed his species in Section Epithemioides, rather than Subgenus Denticula, but the differences are ill-defined. Denticula is now regarded as a separate genus, and Round et al. (1990, p. 622) commented that Denticula is, “Closely related to Nitzschia sect. Grunowia, from which it is difficult to separate, except on the extent of the fibulae.” In Denticula all the fibulae “extend across the valve face, forming partitions running from margin to margin. The fibulae widen at their bases (near the raphe) so that only small apertures (‘portulae’) are left connecting cell interior with subraphe canal.” This is also true of N. janischii, yet fibulae reaching the valve margin is not a synapomorphy for Denticula because a few other Nitzschia species also have this character, e.g., N. rhopalodioides Hustedt (Hustedt 1955, p. 45, pl.15, fig. 16), and even N. ventricosa Kitton (Lobban et al. 2012, pl. 61, figs 1, 2), although there, as in Gomphonitzschia clevei Grunow (Grunow 1880, pl. 14, fig. 11, Peragallo &amp; Peragallo 1897 –1908, pl. 76, fig. 15), some extend only part way and some costae extend part way back from the margin. At present there does not seem to be justification for reclassifying N. janischii in Denticula .</p></div>	https://treatment.plazi.org/id/03826143FF938170FF34FAD71503FFA2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF928170FF34FD56154EF9A5.text	03826143FF928170FF34FD56154EF9A5.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Nitzschia nienhuisii F. A. S. Sterrenburg & F. J. G. Sterrenburg	<div><p>Nitzschia nienhuisii F.A.S. Sterrenburg &amp; F.J.G. Sterrenburg Figs 89–94</p><p>Ref. illus: Sterrenburg &amp; Sterrenburg 1990, figs 2–4; Hein et al. 2008, pl. 59, figs 2, 3</p><p>Samples: GU7R; GU44AY-6; GU52P-1</p><p>Dimensions: Length 49–53 µm, width 16 µm; striae not resolved, even in SEM.</p><p>Diagnostics: Hyaline cells with protracted apices, the raphe raised on a keel, both branches curving to the same side.</p><p>Comments: This species is very similar to a hyaline Entomoneis in our flora, but is distinguished by the raphe branches curving to the same side, whereas those of Entomoneis are sigmoid (curve to opposite sides). The Entomoneis is also larger. When valves are acid cleaned the membranous valve collapses. There do not appear to be fibulae on the keel in the usual sense of them in Nitzschia, and Sterrenburg &amp; Sterrenburg (1990) assigned this species to the genus with hesitation. There are markings on the keel, but these in SEM appear to be nothing more than wrinkles in the membranous valve material. The structure of this species is baffling but may be resolved with TEM.</p></div>	https://treatment.plazi.org/id/03826143FF928170FF34FD56154EF9A5	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF928170FF34FB5A17B5FBAB.text	03826143FF928170FF34FB5A17B5FBAB.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Petroneis humerosa (W. Smith) Stickle & D. G. Mann	<div><p>Petroneis humerosa (Brébisson ex W. Smith) Stickle &amp; D.G. Mann Figs 95–97</p><p>Ref. illus.: Peragallo &amp; Peragallo 1897 –1908, pl. 27, fig. 20; Hustedt 1961 –1966, fig. 1702 (both as Navicula humerosa); Witkowski et al. 2000, pl. 101, figs 2, 3, pl. 102, fig. 3</p><p>Samples: GU44I-3</p><p>Dimensions: Length 45–60 µm, width 29–34 µm; striae 12 in 10 µm</p><p>Diagnostics: Valves broad, linear, slightly rostrate. Strongly radiating striae with coarse areolae; short striae interspersed between longer ones along the central linear part of the valve.</p><p>Comments: Similar to P. latissima Gregory and P. monilifera Cleve (Hustedt 1961 –1966, figs 1701, 1699), but those have coarser striae. There are a number of small ultrastructural differences between Petroneis and Cosmioneis which together warranted their separation (Round et al. 1990: 526); SEMs from a sample in the Davis collection from Saipan, CNMI (Figs 96, 97), show the internal central raphe endings to be crozier- rather than anchor-shaped, suggesting that the Guam specimen is also Petroneis . However, C. delawariensis (Grunow ex Cleve) D.G. Mann (Witkowski et al. 2000, pl. 106, figs 1, 2) is very similar in LM.</p></div>	https://treatment.plazi.org/id/03826143FF928170FF34FB5A17B5FBAB	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF928173FF34F920151CF9C2.text	03826143FF928173FF34F920151CF9C2.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Pinnunavis yarrensis (Grunow) H. Okuno	<div><p>Pinnunavis yarrensis (Grunow) H. Okuno Figs 98–105</p><p>Syn.: Pinnularia yarrensis (Grunow) Jurilj, Navicula yarrensis Grunow</p><p>Naviculales: Naviculaceae .</p><p>Ref. illus.: Grunow in Schmidt et al. 1874–1959, pl. 46, figs 1–6; Meister 1932, pl. 17, fig. 139; Hustedt 1955, pl. 9, fig. 2; Navarro 1983a, figs 108–110; Wah &amp; Wee 1988, fig. 64 (all as Navicula yarrensis); Witkowski et al. 2000, pl. 146, fig. 11; López-Fuerte et al. 2010, pl. 29, figs 1, 2 (both as Pinnularia yarrensis); Okuno, 1975, fig. 8-2 and 2a</p><p>Samples: GU69A-1</p><p>Dimensions: 36–105 µm long, 15–32 µm wide, 4–7 striae in 10 µm.</p><p>Diagnostics: Striae radiate along most of the valve but convergent at the apices. Striae consisting of single alveolus with numerous small poroids in the outer membrane and no inner membrane (Figs 102–104). The two plastids (Fig. 98) extend onto the valve face nearly to the raphe, with closely lobed margins. Valve shape varied from elliptical-lanceolate to linear with broadly rounded apices; size also varied widely in this population.</p><p>Comments: SEM views confirm the images shown by Navarro (1983a). I also noted that the inner margin of the valvocopula is scalloped to fit against the outer edges of the interstriae (Fig. 105). There is a single line of pores near the abvalvar edge of the wide valvocopula (Fig. 103).</p><p>A “striking species of massive sculpture” (Mann 1925:125), and equally handsome alive. This species is usually noted as widespread but scarce (Hustedt 1955:32; Witkowski et al. 2000:338), but was abundant in GU69A-1 from surface sediment at the edge of a mangrove. Navarro (1982a), Wah &amp; Wee (1988) and López-Fuerte et al. (2010) also reported it from mangroves. Meister (1932:43) reported linear valves of the nominate variety from Cavite Bay, Luzon, Philippines (habitat not given). The number of striae reported varies from 3–3.5 in 10 µm (Meister 1932) and 4 in 10 µm (Witkowski et al. 2000), to 10 in 10 µm (Podzorski &amp; Håkansson 1987); the more finely striate forms are not so readily distinguished from Navicula . In my sample, the smaller valves (Fig. 104) had denser striae but appear to still be the same species. Length range in the literature is 60–200 µm (Witkowski et al. 2000); the smallest valve I found was 36 µm long. Several varieties have been named, including three from Miocene deposits (Hajós 1968; California Academy of Sciences 2011). Navicula yarrensis was first transferred to Pinnularia (Jurilj 1957) and later to a new genus, Pinnunavis Okuno (1975), along with P. elegans (W. Smith) Okuno, and this is the currently accepted name for P. yarrensis according to AlgaeBase (Guiry &amp; Guiry 2014). However, Pinnunavis elegans (W. Smith) Okuno was transferred back to Pinnularia by Krammer (1992). The plastids of P. elegans lie along the girdle bands, typical of Navicula and Pinnularia (A. Witkowski, personal communication), whereas those seen here for P. yarrensis spread across the valve face, more like those of some Diploneis . It remains to be seen how these genera are related molecularly.</p></div>	https://treatment.plazi.org/id/03826143FF928173FF34F920151CF9C2	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF918173FF34FAB61040FB10.text	03826143FF918173FF34FAB61040FB10.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Plagiogramma atomus Greville 1863	<div><p>Plagiogramma atomus Greville Fig. 106</p><p>Ref. illus.: Ricard 1977 pl. 10, fig. 10; Witkowski et al. pl. 3, figs 7, 8; Hein et al. 2008, pl. 4, figs 9,10</p><p>Samples: GU44L-E</p><p>Dimensions: Length 25–28 µm, width 13–14 µm; striae ca. 11 in 10 µm</p><p>Diagnostics: The bilobed outline together with the dimensions define this species.</p><p>Comments: Larger and more finely areolate than a more common, so far unidentified specimens close to P. bilobatum . Reported for Guam by Arai (2010, pl. 8, fig. 2).</p></div>	https://treatment.plazi.org/id/03826143FF918173FF34FAB61040FB10	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF918172FF34F9C71006FCCA.text	03826143FF918172FF34F9C71006FCCA.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Pogoneis bahrainii F. E. Round & P. W. Basson	<div><p>Pogoneis bahrainii F.E. Round &amp; P.W. Basson Figs 107–113</p><p>ORDER and Family incertae sedis</p><p>Ref. illus.: Round &amp; Basson 1997, figs 1–3, 13–25</p><p>Samples: GU44I-4</p><p>Dimensions: 15–17 µm long, 2.3–2.7 µm wide; striae 45 in 10 µm (both valves).</p><p>Diagnostics: The monoraphid frustules are very distinctively shaped like a canoe in girdle view because of thickenings on raphe valve (RV) apices and the curvature of the sternum valve (SV). Striae are parallel and comprise slits which are apically elongated on both valves, except diagonal near RV apices.</p><p>Comments: Dimensions and stria densities agree with Round &amp; Basson’s material from Bahrain. A slide from this sample with the holotype of Cyclophora minor (accession #627405, slide 223019) at California Academy of Sciences also has a marked specimen of P. bahrainii . The taxonomic position of this genus was not specified by Round &amp; Basson (1997); as a monoraphid diatom it could have been placed in Achnanthales, but since Cox (2006) removed Achnanthes sensu stricto to Mastogloiales, there is no single order to which all monoraphid taxa belong.</p></div>	https://treatment.plazi.org/id/03826143FF918172FF34F9C71006FCCA	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF908172FF34FD811602FB71.text	03826143FF908172FF34FD811602FB71.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Protokeelia cholnokyi (Giffen) F. E. Round & P. W. Basson	<div><p>Protokeelia cholnokyi (Giffen) F.E. Round &amp; P.W. Basson Figs 114–117</p><p>RHOPALODIALES D.G. Mann: Rhopalodiaceae (Karsten) Topachevs'kyj &amp; Oksiyuk</p><p>Ref. illus.: Giffen 1963, figs 27–29 (as Auricula cholnokyi Giffen); Round &amp; Basson 1995a, figs 1– 9.</p><p>Samples: GU44I-1, GU44J-2, GU44Z-15</p><p>Dimensions: Length 16–19 µm, depth (from ventral corners to apex of dorsal curve) 10–14 µm; striae ca. 18 in 10 µm, measured transversally across striae near the ventral margin.</p><p>Diagnostics: Dorsal (convex) margin nearly circular to weakly reniform; two distinct indentations on the dorsal side of the valve. A ridge (or fold) on the ventral side of the valve arises from points that are not clearly indented and curves closer to the dorsal than the ventral margin. Spines absent.</p><p>Comments: The genus Protokeelia was established by Reimer &amp; Lee (1984) for an endosymbiotic diatom isolated from a foram, and subsequently three new free-living species were described by Round (1993) and Round &amp; Basson (1994, 1995b), all from Bahrain and neighboring Saudi Arabia. The literature was reviewed by Round &amp; Basson (1995a), who re-examined Auricula cholnokyi and transferred it and A. quinquelobata Voigt to Protokeelia, so there are now six species. Although Round &amp; Basson (1995b) wrote that “each new site visited seems to yield a new species,” no further reports of new species have been published in the last 20 years; however, it seems unlikely that the biodiversity of Protokeelia has been exhausted, particularly elsewhere in warm waters. The known species have all been epipelic; the specimens we have seen were collected in algal turfs but these samples typically contain sediment.</p><p>The terminology is somewhat confusing, because the valve shows only one side as usually lying with the raphe on a ridge along the convex (dorsal) margin and the ventral margin more or less concave. The side thus showing is the ventral part of the valve, while the dorsal part is narrower and has the indentations (clearly seen in the whole frustule SEM, Fig. 117). The distinction between P. cholnokyi and P. quinquelobata has not been examined in SEM, but Round &amp; Basson (1995a) assert that “the shape of the valve and of the ridge on the ventral face” suggest the two species are distinct. Voigt’s (1960, pl. 2, figs 8, 9, 10) taxon is more reniform and the ventral ridge arises and curves closer to the ventral margin than is the case in P. cholnokyi . Reexamination of Voigt’s material is needed to verify the distinction. The taxon given in Witkowski et al. (2000, p. 410, pl. 215, figs 11, 12) as “ Protokeelia cholnokyana (Giffen) Round et Basson ” is described as “narrowly reniform” and is much shallower than specimens illustrated by Giffen and Round &amp; Basson.</p></div>	https://treatment.plazi.org/id/03826143FF908172FF34FD811602FB71	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF908175FF34F9E710ACF8F8.text	03826143FF908175FF34F9E710ACF8F8.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Psammodictyon pustulatum (Voigt ex Meister 2015) Lobban 2015	<div><p>Psammodictyon pustulatum (Voigt ex Meister) Lobban, n. comb., n. stat. Figs 118–128</p><p>Basionym: Nitzschia panduriformis var. pustulata Voigt ex Meister 1937, Berichte der Schweizerischen Botanischen Gesellschaft 47: 270, pl. 11, fig. 9.</p><p>Samples: GU66A-1, GU66A-3, GU66F-2, GU66F-7A; GU52Q-10</p><p>Dimensions: Length 22–33 µm, width 13–17 µm; striae 20–24 in 10 µm, fibulae ca. 14 in 10 µm.</p><p>Diagnostics: Differs from all other species of Psammodictyon in the presence of a pair of rounded elevations on the distal side of the sternum.</p><p>Description: Valves panduriform, highly sculptured, with a pair of rounded elevations on the distal side of the sternum and a pair of shallow depressions on the proximal side. Valves apiculate and loculate; areolae in quincunx arrangement, the striae interrupted by a hyaline sternum near the mid line (Figs 123, 124). (The part next to the raphe is considered proximal, and the side toward the mantle where the elevations occur is distal.) The raphe system is submarginal, dividing the valve into a wide ventral portion and a narrow dorsal band; pores on the dorsal portion consist of a longitudinal row of transapical slits (Figs 127, 128: arrows). The dorsal part of the valvocopula has a repand ab valvar edge (Figs 124, 125). The distal part of the ventral valve face bears two rounded elevations; the proximal portion slopes down from the raphe-keel to the sternum in two shallow depressions (Figs 125, 126, 128). Loculae are evident on the elevations (Figs 125, 126) but also can be seen on the proximal side of the sternum (Fig. 125). Girdle bands lack pores, except for a single longitudinal row on the first pleura (Fig. 125: arrow). The valvocopula delimits the ventral margin of the valve with a repand rim and there is a single row of pores at its base on the valve side (Figs 125, 126); however, along the dorsal portion of the valvocopula, the opposite edge is repand (Figs 124, 125).</p><p>Comments: The loculate structure places this taxon in Psammodictyon rather than Nitzschia or Tryblionella; the character combinations distinguishing these genera are described by Round et al. (1990). However, the valve face is sharply delimited by a vertical rim, which appears to be formed by the valvocopula, rather than merging imperceptibly into a shallow mantle on the ventral side, as described by Round et al. (1990) for Psammodictyon . The possibility that this rim is simply due to collapse of the frustule during preparation is unlikely because of the consistency of its appearance in the SEM images and the way it goes down under the dorsal margin (Figs 127, 128).</p><p>I examined Meister’s slide 3509092, and found one specimen —apparently not the type he photographed, however, since it is partially overlain by another diatom (Fig. 121).</p><p>Although Meister (1937) in the same paper also named Nitzschia pustulata, this is entirely different and certainly not a Psammodictyon, so I am confident there will be no future confusion from using pustulatum as the epithet in this new combination.</p><p>Specimens labeled as N. panduriforme var. pustulata occur on two slides in the Hustedt collection (ZT2/46 and W1/18), kindly photographed by Friedel Hinz (one shown in Fig. 122), are identical to my specimens; a similar specimen is illustrated in Stidolph et al. (2012, pl. 25, fig. 83). The known geographic range of P. pustulatum is thus Nagasaki (Japan), Guam, Singapore, Galapagos, and Vera Cruz (Mexico).</p><p>The size and outline of P. pustulatum are similar to P. constrictum in our flora, but the areolae, with single pores on both sides, are like those in P. panduriforme, unlike those in P. constrictum, where there are complex external openings and clusters of 3–4 interior pores. Further differences in P. constrictum are that the areolae on the dorsal side of the raphe-keel are also large, and the pleura has transapical striae all along it (Lobban et al. 2012, pl. 59, figs 7, 8).</p></div>	https://treatment.plazi.org/id/03826143FF908175FF34F9E710ACF8F8	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF978174FF34FA6C1167FC51.text	03826143FF978174FF34FA6C1167FC51.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Pteroncola marina Holmes & Croll	<div><p>Pteroncola marina Holmes &amp; Croll Figs 129, 130</p><p>FRAGILARIALES Silva: Fragilariaceae Greville</p><p>Ref. illus.: Holmes &amp; Croll 1984, figs 2–15; Round et al. 1990, pp. 390–391, figs a–i</p><p>Samples: GU41D-A1; Jordan plankton tow Talofofo; black mangrove roots at Merizo (coll. Shiori Tamura)</p><p>Dimensions: Length 5.3–8.4 µm, width 2.6 µm; striae 75 in 10 µm</p><p>Diagnostics: Small tabulate frustules; exceedingly fine striae consist of very closely spaced pores (smaller than the apical pores); apical pores aligned conspicuously at 90° to the striae, as seen in girdle view. Thickened spots along edge of valve mantle.</p><p>Comments: The striae are alveolate, opening internally by single pores (Round et al. 1990), as in Caloneis and Oestrupia; Fig. 130 is consistent with this, and the pores can be seen through the external areolae. Round et al. (1990) proposed synonymy of P. marina and P. inane (Giffen) F.E. Round ( Dimerogramma inane Giffen 1970a, figs 20–22), which has elevated apices, but reexamination of Giffen’s materials in LM and SEM (A. Witkowski, personal communication) showed that P. marina is distinct. Almandoz et al. (2014) described a new species, P. carlinii Almandoz &amp; Ferrario with much different striae, and also emended the genus description.</p></div>	https://treatment.plazi.org/id/03826143FF978174FF34FA6C1167FC51	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF968174FF34FE071591FB10.text	03826143FF968174FF34FE071591FB10.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Rhoiconeis pagoensis Lobban 2015	<div><p>Rhoiconeis pagoensis Lobban n. sp. Figs 131–138</p><p>NAVICULALES Bessey: Naviculaceae Kützing</p><p>Samples: GU7X-2, GU7X-7</p><p>Dimensions: Length 16–49 µm, width 6.7–7.9 µm; striae 16–22 in 10 µm</p><p>Diagnosis: Differing from the other two species in the stria density.</p><p>Holotype: Slide # 1319 from GU7X-7, Fig. 133. Deposited at California Academy of Sciences, accession # 627426 slide # 220342.</p><p>Type locality: <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=144.79918&amp;materialsCitation.latitude=13.427778" title="Search Plazi for locations around (long 144.79918/lat 13.427778)">Pago Bay</a>, Guam, 13°25'40" N, 144°47'57" E, on shore in University of Guam Marine Laboratory seawater outfall stream, collected by C. Lobban, 3 June 2013 .</p><p>Paratypes: Slides #1265, 1266, 1270–1272 in UOG Diatom Herbarium.</p><p>Etymology: named for the type locality, Pago Bay, itself probably from pagu, the Chamorro name for the tree Hibiscus tiliaceus L., whose bark was traditionally used to make rope.</p><p>Description: Live cells motile, two plastids lying along the girdle faces as in Navicula (Fig. 131, 132). Frustules flexed in girdle view, the central areas of the two usually different, with the broader area on the concave side (Figs 136, 137). Striae lineate, radiate except for short ones bordering the central area (Figs 135, 137). Valvocopula in two segments, with a sigmoid junction near one apex</p><p>(Fig. 138); the smaller segment reminiscent of the end plate in Rhabdonema arcuata (Pocock &amp; Cox 1982) . There were slight differences in stria count common between apices and center, the two apices and the two valves. Frustules did not come apart even after double acid cleaning and I was not able to get SEM of the internal valve face.</p><p>Comments: Samples were collected over several days from a diatom bloom in an outfall stream from the U. Guam Marine Laboratory seawater system. The bloom developed soon after the seawater flow was restarted, epiphytic on a population of the siphonous green alga Trichosolen sp., itself known to be rare except for blooming after a major disturbance (Lobban &amp; Tsuda 2003).</p><p>Rhoiconeis Grunow was resurrected by Medlin (1985) and currently includes two species (Table 1). The genus is characterized by naviculoid frustules flexed in girdle view and having lineate striae and internal siliceous sheets joining the outer parts of the interstriae. There is a distinctive pattern in the girdle bands, with a segmented valvocopula and two pleural bands, as shown in Medlin (1985, fig. 38; compare with my Fig. 138). In Rhoiconeis both valves are raphid, in contrast to Achnanthes; isopolar, in contrast to Rhoicosphenia; and distinguished from Campylopyxis by the pores, girdle bands, and internal valve features. Both known species of Rhoiconeis have radiate, lineate striae and slightly different central areas on the convex and concave valves. Thus, the present material can be positively identified as Rhoiconeis even without good internal views, and can be distinguished from the other species on the basis of valve size and stria density (Table 1).</p></div>	https://treatment.plazi.org/id/03826143FF968174FF34FE071591FB10	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF968177FF34F9C71646F82C.text	03826143FF968177FF34F9C71646F82C.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Rhoicosigma compactum (Greville) Grunow 1877	<div><p>Rhoicosigma compactum (Greville) Grunow Figs 139–143</p><p>Ref. illus.: Van Heurck 1896, pl. 28, fig. 802; Peragallo &amp; Peragallo 1897 –1908, pl. 35, fig. 8 Sample GU52N-7, GU52O-3; GU52P-1</p><p>Dimensions: Length 97–118 µm, width 16–23 µm, striae 20–22 in 10 µm.</p><p>Diagnostics: Frustule bent along the valvar plane (achnanthoid) (Fig. 139); raphe on concave/ventral valve highly sigmoid, the other (convex valve) nearly straight (as for the genus) (Figs 140, 141, 143). Plastids are several large plates (Fig. 139). Central raphe endings overlap on both valves (Fig. 142).</p><p>a</p><p>Numbers in brackets from Cleve (1895), others from Medlin (1985).</p><p>Comments: Hein &amp; Lobban (2015) included two SEMs of this species for comparison with their new species R. parvum . Here I present full documentation of the record. Peragallo &amp; Peragallo (1897 –1908) gave length = 77–180 µm, whereas Van Heurck (1896) gave rather larger dimensions of 140–180 x 35 µm, both gave stria density of 20–24 in 10 µm for R. compactum . R. oceanicum H. Peragallo (Peragallo &amp; Peragallo 1897 –1908, pl. 35, figs 3–7) is still larger (160–260 x 36– 45µm), with still coarser striae (17–18 in 10 µm). Hendey (1964, p. 250) gives dimensions of R. compactum as 90–150 µm, transapical striae 17–20 in 10 µm, longitudinal striae 22–24 in 10 µm, but he cites Peragallo &amp; Peragallo (1897 –1908) figs 3, 4, 6, 7 and 8, whereas their figs 3–7 are identified as R. oceanicum .</p></div>	https://treatment.plazi.org/id/03826143FF968177FF34F9C71646F82C	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF958176FF34FAA0153AFCAF.text	03826143FF958176FF34FAA0153AFCAF.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Seminavis robusta Danielidis & D. G. Mann	<div><p>Seminavis robusta Danielidis &amp; D.G. Mann Figs 144, 145</p><p>Syn.: Seminavis ventricosa (Gregory) M. Garcia-Baptista; Amphora ventricosa Gregory</p><p>Ref. illus.: Hendey 1964, pl. 38, fig. 12 (as Amphora ventricosa); Navarro 1982b, fig. 16 (as Amphora angusta var. ventricosa); Danielidis &amp; Mann 2002, figs 39–53; Wachnicka &amp; Gaiser 2007, figs 221–225; Hein et al. 2008, pl. 57, figs 3, 5; John 2012, figs 125 A–J, 126 A, B (as Seminavis ventricosa); Stidolph et al. 2012, pl. 24, fig. 73 (as Amphora angusta var. ventricosa) Samples: GU52Q-1a, GU52Q-10a</p><p>Dimensions: Length 65–74 µm, width 13–14 µm; dorsal striae strongly radiate at the center, 13–16 in 10 µm, less radiate toward the apices, 15–18 in 10 µm; ventral striae radiate at center, 14 in 10 µm, parallel toward apices, 16–18 in 10 µm.</p><p>Diagnostics: Semi-lanceolate valves, the raphe closer to the ventral side. Axial area asymmetrical, wider on the dorsal side (the hyaline areas seen in SEM to be grooves).</p><p>Comments: Differs from other (as yet unidentified) Seminavis spp. in our flora in the size and coarse striation. The most similar species is S. latior (A. Schmidt) Danielidis &amp; D.G. Mann (2002, figs 35–41, and see Wachnicka &amp; Gaiser 2007, figs 226, 227), in which the striae are uniformly spaced throughout, both 13–15 in 10 µm, and the ventral striae are radiate throughout, rather than parallel toward the apices. The width of our specimens matches the range given by Danielidis &amp; Mann (2003) for S. latior and not S. robusta, but the range given by Wachnicka &amp; Gaiser (2007) encompasses our broader specimens. More clearly distinct are S. basilica Danielidis (Danielidis &amp; Mann 2003, figs 1–19), which has denser (19–25 in 10 µm), parallel striae throughout on both ventral and dorsal surfaces, and S. insignis Álvarez-Blanco &amp; S. Blanco (2014), 20–26 dorsal striae in 10 µm.</p></div>	https://treatment.plazi.org/id/03826143FF958176FF34FAA0153AFCAF	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
03826143FF948176FF34FE241531FE94.text	03826143FF948176FF34FE241531FE94.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Surirella fastuosa Ehrenberg	<div><p>Surirella cf. fastuosa Ehrenberg, sensu Ruck &amp; Kociolek 2004 Figs 146–149</p><p>Ref. illus.: Ruck &amp; Kociolek 2004, pl. 11–13</p><p>Samples: GU44L-C, GU44AQ-1, GU44AQ-3, GU44AR-1, GU66A-2, GU66C-7, GU66F-4 Dimensions: Length 62–81 µm, width 39–45 µm. Infundibula 2.5 in 10 µm.</p><p>Diagnostics: Broadly oval, the sides nearly straight, sometimes very weakly indented; neither the valve margin nor the keel markedly constricted or convex at the center. Lanceolate central area (circlet) with external ribs, but lacking short striae on the perimeter; puncta completely absent on internal side of circlet.</p><p>Comments: Plastids: two lobed plates, as in typical Surirella fastuosa (Fig. 146). Larger, more oval, and more symmetrical than S. fastuosa, and without the short striae on the circlet. These specimens match the California sample described by Ruck &amp; Kociolek (2004), except for the complete lack of puncta on the inner face of the circlet here. Ruck &amp; Kociolek identified their material only as comparable to S. fastuosa “until such time as the type material is examined and the variability in morphology documented.” Given this situation, I list this taxon as separate from S. fastuosa .</p></div>	https://treatment.plazi.org/id/03826143FF948176FF34FE241531FE94	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Plazi	Lobban, Christopher S.	Lobban, Christopher S. (2015): Benthic marine diatom flora of Guam: new records, redescription of Psammodictyon pustulatum n. comb., n. stat., and three new species (Colliculoamphora gabgabensis, Lauderia excentrica, and Rhoiconeis pagoensis). Micronesica 2015 (2): 1-49, DOI: 10.5281/zenodo.12117576
