taxonID	type	description	language	source
954A5C32D3E85DB7AB5B16CAA4B192A8.taxon	description	Fig. 1	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
954A5C32D3E85DB7AB5B16CAA4B192A8.taxon	materials_examined	Material used. Sample 110 (Karkar Island, Village of Mom, Papua New Guinea).	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
954A5C32D3E85DB7AB5B16CAA4B192A8.taxon	description	LM description. Frustules cylindrical in girdle view, usually solitary. Valves disc-shaped. Valve dimensions (n = 15): diameter 13 - 30 μm, mantle height 5.0 - 7.5 µm. Valve surface flat, sloping abruptly at the valve face / mantle junction, visible in LM as a darker circular edge. Central area small, maximum 1 / 4 to 1 / 5 of the total valve diameter, rounded. Three (very rarely 2) large, rounded carinoportulae present, number constant irrespective of the valve diameter. Valve face areolae small, arranged in radiate, uniseriate striae of variable length, 18 - 24 in 10 μm. Striae often branching near the valve margin. Short, irregular ridges present, scattered over the entire valve face, visible at different focal level (Fig. 1 A). Presence of caverns along the edge of the mantle, visible as regular, darker areas, 5 - 7 per valve. Figure 1 A-D.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
954A5C32D3E85DB7AB5B16CAA4B192A8.taxon	description	SEM description. Cingulum composed of several broad, open, ligulate copulae, perforated with at least 5 - 7 parallel rows of very small pores (Fig. 1 E-G). Valvocopula with thin, broad extensions, covering plate-like the valve interior (Fig. 1 F, M). Mantle shallow (Fig. 1 E, G), occasionally with a clear step halfway the valve mantle (Fig. 1 E). Advalvar part of the mantle with regular striation pattern. Mantle striae composed of up to 10 areolae, 22 - 25 in 10 µm (Fig. 1 E, G). Valve face flat. Central area hyaline, small. Three (rarely two, see Fig. 1 E) carinoportulae visible with raised, irregularly shaped, cylindrical collar (Fig. 1 H, I), occasionally obscured by a plate-like covering (Fig. 1 H). Valve face entirely covered by an often network-like raised pattern of ridges (Fig. 1 E, H-J). Halfway between valve edge and centre, several much denser groupings of short and longer ridges present, regularly placed in a ring around the central area (Fig. 1 E, H-J). Striae uniseriate, composed of small, rimmed areolae (Fig. 1 J). Short, thick acute marginal spines present at the valve face / mantle junction (Fig. 1 E, G). Marginal pore fields present (Fig. 1 E, G). Areolae covered in the valve interior by individual hymenate vela (Fig. 1 K, L). Carinoportulae pit-like, visible as large, rounded depressions, filled with irregular siliceous outgrowths (Fig. 1 K, L). Between the carinoportulae, several long slits present, arranged in a star-shaped manner (Fig. 1 L). Internal caverns visible as shallow depressions on the valve face / mantle junction (Fig. 1 K). Figure 1 E-M.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
30E387D45594547592F90F2A480CF0DE.taxon	description	Fig. 3	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
30E387D45594547592F90F2A480CF0DE.taxon	materials_examined	Type. Mont Wilhelm, Papua New Guinea, sample 17; holotype: slide BR- 4817, BR; the valve representing the type is illustrated here in Fig. 3 F; isotype: slide 433, University of Antwerp, Belgium.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
30E387D45594547592F90F2A480CF0DE.taxon	description	LM description. Frustules cylindrical in girdle view. Valves disc-shaped. Valve dimensions (n = 20): diameter 8.0 - 21.5 μm, mantle height 5.0 - 7.5 µm. Valve face flat, sloping abruptly at the valve face / mantle junction, visible in LM as a darker circular edge. Central area very small, maximum 1 / 5 of the total valve diameter, irregular in shape. Three large, rounded carinoportulae present, number constant irrespective of the valve diameter. Between the carinoportulae scattered areolae present. Striae on the mantle long, uniseriate, ca 24 in 10 μm. Valve face areolae small, arranged in radiate, uniseriate striae, 20 - 22 in 10 µm. Caverns, internal undulations or internal valves not observed. Figure 3 A-G.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
30E387D45594547592F90F2A480CF0DE.taxon	description	SEM description. Cingulum composed of open, ligulate girdle bands bearing several, often incomplete, rows of large, rounded poroids (Fig. 3 H-I). Parallel, uniseriate series of rounded, fairly large areolae present on the valve mantle, ca 24 in 10 µm. Often a clear step present halfway the valve mantle (Fig. 3 J). Valve face flat, plate-like structures, irregular in shape, surrounding the entire valve face (Fig. 3 K, L). Plate-like structures lacking perforations become linking plates, continuing onto the mantle as weakly raised, sometimes bifurcated ridges, flattening in the middle of the mantle height (Fig. 3 H, J-L). Irregular pattern of smaller siliceous ridges, varied in length, present in the central part of the valve face, also between carinoportulae (Fig. 3 L, N). Usually three carinoportulae surrounded by a siliceous collar present in very small pore-free central area (Fig. 3 L, N). Striae radial composed of rounded areolae. Striae between ridges continuing on the mantle (Fig. 3 H, K). Internally areolae appearing as small poroids with irregular caltrop-like structure inside (Fig. 3 M, O, P). Slit-like openings present between the areolae (Fig. 3 P). Carinoportulae unoccluded, ornamented with small granules (Fig. 3 O). Between the carinoportulae, three long slits present (Fig. 3 O), arranged in a star-shaped manner. Internal caverns not observed. Figure 3 H-P.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
30E387D45594547592F90F2A480CF0DE.taxon	etymology	Etymology. The species is named in honour of our (retired) colleague Dr Robert Iserentant (UCL, Belgium) to honour his life-long career as a diatom scientist.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
2F93B8D87EE75485A394F5A35654B6F6.taxon	description	Fig. 4	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
2F93B8D87EE75485A394F5A35654B6F6.taxon	materials_examined	Type. Boisa Island, Papua New Guinea, sample 158; holotype: slide BR- 4818, BR; the valve representing the type is illustrated here in Fig. 4 F; isotype: slide 434, University of Antwerp, Belgium.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
2F93B8D87EE75485A394F5A35654B6F6.taxon	description	LM description. Frustules cylindrical in girdle view, connected to each other forming short chains (Fig. 4 G, H). Valves disc-shaped. Valve dimensions (n = 20): valve diameter 6.5 - 23.0 μm, mantle height 8.0 - 9.5 µm. Valve face flat, sloping abruptly at the valve face / mantle junction, visible in LM as a darker circular edge. Central area small, maximum 1 / 4 of the total valve diameter, irregular in shape. Three to four large, rounded carinoportulae present. Between the carinoportulae scattered areolae present. Striae on the mantle long, uniseriate, 22 - 24 in 10 μm. Valve face areolae rather small, arranged in radiate, uniseriate striae, 16 - 22 in 10 µm. Caverns, internal undulations or internal valves not observed. Figure 4 A-H.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
2F93B8D87EE75485A394F5A35654B6F6.taxon	description	SEM description. Valve face flat, striae radial composed of round rimmed areolae (Fig. 4 L). Near the valve edge, areolae slightly larger (Fig. 4 I-K). Irregular pattern of small siliceous curving ridges, of variable length and shape, present over the entire valve face, including between the carinoportulae. Several (3 - 4) carinoportulae in the central area, surrounded by irregular siliceous circular ridges (Fig. 4 J, L), often obscured by plate-like coverings (Fig. 4 I, K). Small acute spines irregularly scattered along the valve face / mantle junction, occasionally absent (Fig. 4 I, K, M). Mantle very deep composed of two parts, advalvar with areolae organised in parallel, uniseriate series, 22 - 24 in 10 µm, located between weakly raised ridges. Ridges flattering in the middle of the mantle, followed by a hyaline, non-perforated abvalvar part (Fig. 4 M, O). Internally areolae occluded with individually hymenate vela (Fig. 4 N). Carinoportulae pit-like, formed by large rounded foramina, filled with siliceous plug (Fig. 4 N). Between the carinoportulae, three long slits present (Fig. 4 N), arranged in a star-shaped manner. Internal caverns not observed. Cingulum composed of broad, open, ligulate girdle bands, perforated with a large number of scattered poroids, irregularly organised in parallel series (Fig. 4 M, O). Figure 4 I-O.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
2F93B8D87EE75485A394F5A35654B6F6.taxon	etymology	Etymology. The specific epithet " Orthoseira papuensis " refers to the geographic locality where the new species was found.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
CDE5571BE15B5BC8A8B2D3EE6ACB0124.taxon	description	Fig. 2	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
CDE5571BE15B5BC8A8B2D3EE6ACB0124.taxon	materials_examined	Material used. Sample 156 (Boisa Island, Papua New Guinea).	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
CDE5571BE15B5BC8A8B2D3EE6ACB0124.taxon	description	LM description. Frustules short, cylindrical in girdle view, connected to each other with spines forming short chains (Fig. 2 F). Valves disc-shaped. Valve dimensions (n = 15): diameter 9.5 - 39.0 μm, mantle height 5 - 14 µm. Valve surface flat, sloping abruptly at the valve face / mantle junction, visible in LM as a darker circular edge. Spiraling to straight thick, siliceous ridges extending from the valve edge to almost 2 / 3 onto the valve face, leaving only a small central area. Central area small, maximum 1 / 4 to 1 / 5 of the total valve diameter, irregular in shape, hyaline in the middle, surrounded by short series of scattered areolae. Three large, rounded carinoportulae present, number constant irrespective of the valve diameter. Striae on the mantle short, uniseriate, composed of rather large areola, located between the ridges, 16 - 18 in 10 μm. Valve face areolae rather small, arranged in irregular uniseriate striae, ca 22 in 10 µm. Caverns, internal undulations or internal valves not observed. Copulae number variable. Figure 2 A-F.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
CDE5571BE15B5BC8A8B2D3EE6ACB0124.taxon	description	SEM description. Cingulum composed of several broad, open copulae. One complete and one incomplete rows of small poroids present on the copulae (Fig. 2 G-I). All copulae open bearing a long ligula and fimbriate edge (Fig. 2 G-I). Mantle rarely shallow (Fig. 2 J), usually deep (Fig. 2 H), occasionally with a clear step halfway the valve mantle (Fig. 2 H). Advalvar mantle edge with several irregular series of small areolae (Fig. 2 G, J). Abvalvar edge broad, hyaline. Marginal pore fields absent. Platelike ridges extending from the valve face onto the advalvar edge of the mantle. Areolae visible between the ridges (Fig. 2 G, H). Valve face flat in the central part surrounded by a ring of spiralling to straight, platelike linking structures, radially arranged on the valve face / mantle junction (Fig. 2 J). Between the plates, up to three series of areolae present. Central area hyaline surrounded by scattered areolae. Three carinoportulae visible, each surrounded by a low, cylindrical collar (Fig. 2 J-K). Areolae covered in the valve interior by individual hymenate vela (Fig. 2 L, M). Carinoportulae pit-like, visible as large, rounded depressions, filled with siliceous plug (Fig. 2 M). Between the carinoportulae, three long slits present (Fig. 2 M), arranged in a star-shaped manner. Internal caverns not observed. Figure 2 G-M.	en	Kochman-Kedziora, Natalia, Van de Vijver, Bart (2024): The genus Orthoseira (Orthoseiraceae, Bacillariophyta) in Papua New Guinea with the description of two new species. Plant Ecology and Evolution 157 (2): 113-124, DOI: http://dx.doi.org/10.5091/plecevo.115801, URL: http://dx.doi.org/10.5091/plecevo.115801
