taxonID	type	description	language	source
2E1787DDFFE8FFED9688F88B4C090F0F.taxon	description	Grimardia Chevreux, 1889: 284 (type species: Grimardia armata Chevreux, 1889).	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE8FFED9688F88B4C090F0F.taxon	diagnosis	Diagnosis [modified from J. L. Barnard & Karaman (1991)]. Body compressed, smooth or weakly carinate; urosomites 2 and 3 coalesced (except for Seba aloe Karaman, 1971). Rostrum obsolete, lateral lobes well developed, eyes absent [except for S. typica (Chilton, 1884)]. Antennae 1 and 2 of medium length, extending equally; peduncle of antenna 1 long, articles 1 and 2 longer than article 3; accessory flagellum present (except for S. tropica), 2 - articulate, article 2 tiny; flagella of both antennae short. Mandibular incisor developed, toothed, molar reduced; palp long, with 3 articles, article 2 elongate, article 3 with 1 – 3 (mostly 2) apical setae. Labium with well-developed mandibular lobes, inner lobes indistinct. Maxilla 1 with blunt inner plate bearing 0 – 2 apical setae, outer plate with 7 apical setae; palp elongate, 1 - articulate, with 1 – 4 apical setae. Maxilla 2 formed of weakly setose similar plate, outer plate bearing 3 – 5 setae. Plates of maxilliped moderately developed, poorly setose; palp stout, 4 - articulate, dactylus unguiform. Coxae 1 – 4 of medium length, coxa 4 poorly excavate posteriorly; coxae 5 – 7 moderately shortened. Gnathopod 1 weakly chelate or subchelate; carpus short, lobed; propodus broad. Gnathopod 2 slender, strongly chelate; ischium elongate; carpus long, unlobed; propodus elongate, forming a chela with fitted dactylus. Pereopods 3 and 4 similar, ordinary; pereopods 5 – 7 relatively similar to each other, bases expanded, meri often expanded and lobate. Coxal gills present on pereopods 2 or 3 to 6, oostegites of female on pereopods 2 – 5. Pleopods ordinary. Uropods 1 and 2 biramous, stout, weakly spinose or almost naked, outer rami subequal or slightly shorter than inner rami; uropod 3 uniramous, peduncle short, ramus much longer than peduncle, 2 - articulate. Telson linguiform, longer than broad, entire, poorly setulose. Sexual dimorphism often present in gnathopod 1 and pereopods 5 – 7.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE8FFED9688F88B4C090F0F.taxon	discussion	Remarks. Walker (1907) proposed to call the genus Seba Stebbing, 1875, with Seba saundersi Stebbing, 1875 as the type species, because the existence of S. innominata had been questioned (Stebbing, 1888; Della Valle, 1893); Karaman (1971) approved of the proposal, and Holman & Watling (1983) also pointed out this taxonomic problem. However, referring the International Code of Zoological Nomenclature (International Commission of Zoological Nomenclature, 1999: Articles 50.1, 67.2), Bate’s (1862) nomenclature is valid. Shaw (1989) presented the following characters for the diagnosis of the new genus Caribseba: (1) antenna 1 without accessory flagellum, (2) inner plate of maxilla 1 without apical seta, and (3) mandibular palp segment 3 with single apical seta. Although only Carib s eba tropica, the type species of the genus, actually has the character (1) in the species of the genera Seba and Caribseba, the characters (2) and (3) are shared with some of the Seba species as Winfield et al. (2009) stated [character (2): S. alvarezi, S. ekepuu J. L. Barnard, 1970 and S. robusta; character (3): S. ekepuu and S. robusta]. Moreover, there are wide morphological variations in the genus Seba [e. g. the presence of eyes in Seba typica, and the separated urosomites 2 and 3 in S. aloe]; therefore, Caribseba should be restored to Seba.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE9FFEB9688F9714FDC0B26.taxon	materials_examined	Material examined. Two males, 3.1, 2.3 mm (OMNH-Ar- 7701, 7702) and 2 females, 3.7, 2.3 mm (OMNH- Ar- 7703, 7704), Rinkai in Shirahama, Wakayama Prefecture, from a sponge Callyspongia confoederata (Ridley, 1884) cast ashore, 18 August 1992, coll. H. Ariyama.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE9FFEB9688F9714FDC0B26.taxon	description	Description. Male [based on mall '' 1 '', 3.1 mm (OMNH-Ar- 7701)]. Body (Fig. 1) roundish, urosomites 2 and 3 coalesced, eyes absent. Antenna 1 (Fig. 2 A), ratio of peduncular articles 1 – 3 1: 1: 0.3, surface of peduncle almost bare; accessory flagellum present, with 2 articles; primary flagellum with 4 articles, posteroproximal part of article 1 with bundle of aesthetascs, distal ends of articles 1 and 2 each with 2 aesthetascs. Antenna 2 (Fig. 2 B), ratio of peduncular articles 3 – 5 1: 0.6: 0.2, ventrodistal corner of article 3 with 2 penicillate setae; flagellum with 3 articles. Labrum (Fig, 2 C) longish triangular, without setae. Mandible (Fig. 2 C, D), molar reduced; palp article length ratio 1: 2.4: 2, articles 2 and 3 with many fine setae, article 3 with 2 apical setae. Labium (Fig. 2 E), outer lobes bearing thin setae on distal margin. Maxilla 1 (Fig. 2 F, F 1 – 3), inner plate bare, outer plate with bifid apical setae; palp with 3 apical setae: 1 large bifid, 1 triangular and 1 spear-like setae. Maxilla 2 (Fig. 2 G) with inner and outer plates bearing 3 and 4 apical thick setae, respectively. Maxilliped (Fig. 2 H), inner plate bearing 1 large bifid, 1 spear-like and 1 normal setae distally; outer plate with 3 medial robust setae; palp article 3 setose medially. Gnathopod 1 (Fig. 3 A, A 1) large, subchelate; coxa rounded posterodistally; basis broadened distally, with 2 setae on posterior margin; merus and carpus setose posterodistally; propodus stout, projected posterodistally, projection with a pair of small robust setae, palm with 1 large triangular, 1 small trapezoidal and 2 minute processes, middle part of posterior margin setose; dactylus wide, gradually curved, posterior margin with large process in the middle. Gnathopod 2 (Fig. 3 B, B 1) slender, strongly chelate; coxa rounded posterodistally, gill absent; basis gradually curved anteriorly; carpus 0.8 times as long as propodus; propodus short, distal end with a pair of minute robust setae; tip of dactylus curved. Pereopods 3 and 4 (Fig. 3 C, D), posterodistal corners of coxae rounded; meri relatively wide, anterodistal corners acutely pointed. Pereopod 5 (Fig. 3 E), coxa bilobed; basis roundish rectangular; merus expanded, posterior margin with 4 robust setae; carpus subequal length to propodus. Pereopod 6 (Fig. 3 F), coxa bilobed, anterior lobe small; basis oval; merus broadened, posterior margin with 4 robust setae; carpus subequal length to propodus. Pereopod 7 (Fig. 3 G), coxa triangular; basis greatly expanded posterodistally, posterior margin serrate, proximal part of medial surface with a few setae; merus widely expanded posterodistally, distal margin of lobe rounded, posterior margin weakly serrate, anterior half of lateral surface bearing sparse short setae; carpus 0.9 times as long as propodus. Epimeral plates 2 and 3 (Fig. 3 H) slightly drawn out posteroventrally; ventral margins of plates 1 – 3 with 1, 2 and 2 lateral spines, respectively. Uropod 1 (Fig. 4 A), peduncle shorter than both rami, with 1 dorsal, 1 lateral and 2 distal robust setae; both rami subequal in length, without setae. Uropod 2 (Fig. 4 B), peduncle subequal length to that of uropod 1, with 1 dorsal and 2 distal robust setae; both rami subequal in length, bare. Uropod 3 (Fig. 4 C) stout; peduncle with 2 distal fine setae; 1 st article of ramus with 2 fine setae dorsally, medial surface with minute distal process, 2 nd article small. Telson (Fig. 4 D) with a pair of dorsal setae. Female [based on female '' 1 '', 3.7 mm (OMNH-Ar- 7703)]. Gnathopod 1 (Fig. 4 E, E 1) small, weakly chelate; coxa rounded posterodistally; basis slender, posterodistal corner with short seta; merus and carpus setose posteriorly; propodus projected posterodistally, projection with a pair of small robust setae, palm smooth, posterior margin setose in the middle; dactylus narrow, almost straight. Gnathopod 2 (Fig. 4 F, F 1) slender, strongly chelate; coxa rounded posterodistally, gill absent; basis slightly curved anteriorly; carpus 0.7 times as long as propodus; distal end of propodus with a pair of minute robust setae. Pereopods 5 and 6 almost same as those of male. Pereopod 7 (Fig. 4 G) almost same as that of male, but merus narrower and posterior margin with 5 robust setae. Pleopods (Fig. 4 H – J) long, pleopod 3 shortest; peduncles each with 2 coupling hooks and 1 – 4 plumose setae; outer and inner rami each with 4 and 3 articles, respectively. Variation of male with growth. Male '' 2 '', 2.3 mm (OMNH-Ar- 7702): gnathopod 1 (Fig. 4 K), palm with 2 triangular and 1 small processes, posterior margin of dactylus without process; pereopod 7, merus narrower than that of male '' 1 '', but apparently different from female.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE9FFEB9688F9714FDC0B26.taxon	discussion	Remarks. The morphological characters of this species almost agree with the descriptions and figures of Moore (1987) and Ledoyer (1978, 1986). This species is distinctive in the robust subchelate gnathopod 1 and the spread merus of pereopod 7 in male. However, the width of the merus varied with the previous reports: the merus in the present study resemble that in Chilton (1921) and Ledoyer (1978), but is wider and posterodistally rounder than that in Moore (1987) and Ledoyer (1986). Habitat. A sponge Callyspongia confoederata (present study); a brown alga Ecklonia holdfast and sponge, 3 – 4 m deep (Moore, 1987).	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE9FFEB9688F9714FDC0B26.taxon	distribution	Distribution (Fig. 5). Japan: Shirahama in Wakayama Prefecture (present study); Australia: Flinders Island (Chilton, 1921), Tasmania (Moore, 1987); Mauritius (Ledoyer, 1978); Madagascar (Ledoyer, 1986). In addition, S. typica recorded at Bunaken Island in Indonesia (Ortiz & Lalana, 1997) may be S. chilton, because Seba chiltoni is close to S. typica (Moore, 1987) which is distributed only in New Zealand (Chilton, 1884, 1906), off Tierra del Fuego (Holman & Watling, 1983) and the Beagle Channel (Chiesa & Alonso, 2007).	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFEFFFE79688FD974CE20DEE.taxon	materials_examined	Material examined. Three males, 1.5, 1.4, 1.4 mm (OMNH-Ar- 7705 – 7707), 5 females, 1.6, 1.6, 1.6, 1.6, 1.5 mm (OMNH-Ar- 7708 – 7712), and 2 ovigerous females, 1.5, 1.4 mm (OMNH-Ar- 7713, 7714), Tagurazaki, Wakayama City in Wakayama Prefecture, uppermost part of sublittoral zone, coarse sand bottom, using decantation method, 30 June 2007, coll. H. Ariyama. One male, 1.1 mm (OMNH-Ar- 7715), Nezumi Island, Chita Town in Aichi Prefecture, 4 m deep, shell bottom, using decantation method, 5 August, 2001, coll. H. Ariyama.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFEFFFE79688FD974CE20DEE.taxon	description	Description. Based on male " 2 ", 1.4 mm (OMNH-Ar- 7706), female " 1 ", 1.6 mm (OMNH-Ar- 7707) for body and female gnathopods and pereopods, and female " 2 ", 1.6 mm (OMNH-Ar- 7708) for epimeral plates. Body (Fig. 6) small, relatively slender, urosomites 2 and 3 coalesced, eyes absent. Antenna 1 (Fig. 7 A), ratio of peduncular articles 1 – 3 1: 0.8: 0.4, ventrodistal corner of article 1 with 2 penicillate setae, dorsodistal and ventrodistal edges of article 2 each with penicillate seta, dorsodistal and ventrodistal corners of article 3 with penicillate seta and aesthetasc, respectively; accessory flagellum present, with 2 articles; primary flagellum with 4 articles, distal ends of articles 1 and 2 with 2 and 1 aesthetascs, respectively. Antenna 2 (Fig. 7 B), ratio of peduncular articles 3 – 5 1: 0.8: 0.1, distal edge of articles 3 and 4 each with 2 penicillate setae; flagellum with 2 articles. Labrum (Fig, 7 C) roundish triangular, without setae. Mandible (Fig. 7 C), molar indistinct; palp article length ratio 1: 3.1: 1.1, article 2 with 1 – 2 short setae, article 3 with single apical seta. Maxilla 1 (Fig. 7 E, E 1), inner plate bare, outer plate with various-shaped apical setae and several fine medial setae, palp with 2 apical setae. Maxilla 2 (Fig. 7 F), inner and outer plates with 2 and 3 apical setae, respectively. Maxilliped (Fig. 7 G), inner plate with 3 apical setae, outer plate with 2 medial and 1 apical setae; palp weakly setose. Gnathopod 1 (Fig. 8 A, A 1) small, chelate; coxa rounded posterodistally; basis slender, broadened distally, with seta on posterodistal corner; ischium, merus and carpus with 1, 2 and 1 pectinate setae posteriorly; propodus projected posterodistally, tip of projection with a pair of minute robust setae, palm smooth, posterior margin setose in the middle; dactylus narrow, weakly curved. Gnathopod 2 (Fig. 8 B) slender, strongly chelate; coxa square posterodistally, gill absent; basis almost straight; carpus 0.4 times as long as propodus; propodus and dactylus long. Pereopods 3 and 4 (Fig. 8 C, D), posterodistal corners of coxae roundish square; bases widened distally. Pereopod 5 (Fig. 8 E), coxa bilobed; basis rectangular, but narrowed distally; merus narrow; carpus 0.7 times as long as propodus. Pereopod 6 (Fig. 8 F), coxa bilobed, anterior lobe small; basis ovoid, broadened proximally, posterior margin serrate; merus narrow; carpus 0.7 times as long as propodus. Pereopod 7 (Fig. 8 G), coxa ovoid; basis widely expanded, broadened proximally, anterior margin with several small robust setae, posterior margin serrate; merus narrow; carpus 0.6 times as long as propodus. Epimeral plates (Fig. 9 I), posteroventral corner rounded in plate 2 and pointed minutely in plate 3; ventral margin of plate 3 with short seta. Pleopods (Fig. 9 A – C), peduncles each with 2 coupling hooks but without setae; outer and inner rami each with 3 and 2 articles, respectively, plumose setae of rami long. Uropod 1 (Fig. 9 D), peduncle much shorter than both rami, with 2 distal setae; outer ramus shorter than inner, both rami curved dorsally, bare. Uropod 2 (Fig. 9 E), peduncle longer than that of uropod 1, with distal robust seta; outer ramus subequal length to inner, both rami bare, but proximal margin of inner ramus pectinate. Uropod 3 (Fig. 9 F), peduncle with short distal seta; 1 st article of ramus with 2 short distal setae, 2 nd article relatively stout. Telson (Fig. 9 F) roundish triangular, with a pair of distal setae. Female gnathopods 1 and 2 (Fig. 9 G, H) and pereopods 5 – 7 almost same as those of male except for oostegites.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFEFFFE79688FD974CE20DEE.taxon	discussion	Remarks. This species has the proximally broadened bases of pereopods 5 – 7, and the peduncle of uropod 1 shorter than that of uropod 2. The present specimens share these characters with Seba ekepuu in J. L. Barnard (1970) and Ledoyer (1979, 1986). In the other characters, the specimens also agree with them; however, numbers of setae in maxilla 2 is different from J. L. Barnard (1970) (inner plate: 3, outer plate: 4). J. L. Barnard (1970) and Ledoyer (1979, 1986) described based on the materials of sex unknown, female and male?, respectively. In the present study, I described both of the correct male and female of this species, and revealed that the sexual dimorphism is indistinct. Habitat. Coarse sand or shell bottom, 0 – 4 m deep (present study); a brown alga Sargassum, algae, rocks, corals, intertidal (J. L. Barnard, 1970); sand, gravel, a red alga Melobesia, 3 – 36 m deep (Ledoyer, 1979).	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFEFFFE79688FD974CE20DEE.taxon	distribution	Distribution (Fig. 5). Japan: Tagurazaki in Wakayama Prefecture, Nezumi Island in Aichi Prefecture; Hawaii (J. L. Barnard, 1970, 1971); Madagascar (Ledoyer, 1979, 1986).	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE3FFFD9688FACE4B170A6B.taxon	materials_examined	Material examined. Holotype: male, 4.3 mm (OMNH-Ar- 7716), off Soneura, Kata Bay, Mie Prefecture (33 ° 58 ' 10 '' N, 135 ° 12 ' 35 '' E), 30 m deep, mud bottom, Ekman – Birge sampler, 27 August 1998, coll. H. Yokoyama. Allotype: ovigerous female, 4.1 mm (OMNH-Ar- 7717), same data as holotype. Paratypes: 3 males, 4.5, 3.1, 2.7 mm (OMNH-Ar- 7718 – 7720) and 1 female, 1.9 mm (OMNH-Ar- 7721), same data as holotype; 1 male, 2.4 mm (OMNH-Ar- 7722), same place, 31 m deep, sandy-mud bottom, Ekman – Birge sampler, 27 August 1998, coll. H. Yokoyama; 1 male, 6.0 mm (OMNH-Ar- 7723) and 1 female, 4.1 mm (OMNH-Ar- 7724), Owase Bay, Mie Prefecture, ca. 25 m deep, mud bottom, Ekman – Birge sampler, 13 May 1997, coll. H. Yokoyama.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE3FFFD9688FACE4B170A6B.taxon	description	Description. Male (based on holotype, 4.3 mm). Body (Fig. 10) roundish, urosomites 2 and 3 coalesced, eyes absent. Antenna 1 (Fig. 11 A), ratio of peduncular articles 1 – 3 1: 0.9: 0.4, laterodistal corner of article 1 with 2 penicillate setae, dorsodistal edge of article 2 with penicillate seta; accessory flagellum present, with 2 articles; primary flagellum with 5 articles, distal ends of articles 2 – 4 each with aesthetasc. Antenna 2 (Fig. 11 B), ratio of peduncular articles 3 – 5 1: 0.6: 0.3, ventral surface of article 3 with 3 penicillate setae; flagellum with 2 articles. Labrum (Fig, 11 C) triangular, without setae. Mandible (Fig. 11 D, E), molar reduced to several serrate spines; palp article length ratio 1: 3.5: 2.5, article 3 with 2 apical setae. Maxilla 1 (Fig. 11 G, G 1), inner plate with single apical seta, outer plate with various-typed apical setae, palp with 2 apical setae. Maxilla 2 (Fig. 11 H), inner and outer plates with 3 and 4 apical setae, respectively. Maxilliped (Fig. 11 I), inner plate with 2 fine apical setae, outer plate with 3 medial and 1 apical robust setae. Gnathopod 1 (Fig. 12 A, A 1) small, weakly chelate; coxa rounded posterodistally; basis slender, with 4 setae on posterior margin; merus and carpus setose posteriorly; propodus projected posterodistally, projection with a pair of small robust setae, palm with 3 obtuse processes, distal part of posterior margin setose; dactylus narrow, strongly curved. Gnathopod 2 (Fig. 12 B, B 1) strongly chelate; coxa rounded posterodistally, gill absent; basis broadened distally, curved anteriorly; carpus long, 1.1 times as long as propodus; distal end of propodus with a pair of minute robust setae; tip of dactylus curved. Pereopods 3 and 4 (Fig. 12 C, D) slender, posterodistal corners of coxae square. Pereopod 5 (Fig. 12 E), coxa bilobed; basis rectangular; merus swollen in the middle; carpus 0.9 times as long as propodus. Pereopod 6 (Fig. 12 F), coxa bilobed, anterior lobe small; basis rectangular; merus relatively broadened; carpus 0.9 times as long as propodus. Pereopod 7 (Fig. 12 G), coxa triangular; basis greatly expanded, anterodistal corner protruded, posterior margin serrate, proximal part of medial surface with several setae; merus slender; carpus 0.8 times as long as propodus. Epimeral plates 2 and 3 (Fig. 13 A) drawn out posteroventrally; ventral margins of plates 2 and 3 with 4 and 5 lateral spines, respectively. Pleopods (Fig. 13 B – D) long, pleopod 3 shortest; peduncles each with 2 coupling hooks and a few plumose setae; outer and inner rami each with 5 and 4 articles, respectively. Seba latiquinta Holotype, male, 4.3 mm (OMNH-Ar- 7716). A, left antenna 1, dorsal view; B, left antenna 2, lateral view; C, labrum, anterior view; D, right mandible, medial view; E, left mandible, lateral view; F, labium, ventral view; G, left maxilla 1, ventral view; G 1, apical part of outer lobe of left maxilla 1, ventral view; H, left maxilla 2, ventral view; I, right maxilliped, ventral view. Scales: 0.05 mm. Uropod 1 (Fig. 13 E), peduncle longer than both rami, with 1 dorsal and 2 distal robust setae; outer ramus shorter than inner, both rami bare. Uropod 2 (Fig. 13 F), peduncle shorter than that of uropod 1, with 2 distal robust setae; outer ramus shorter than inner, inner ramus with dorsal robust seta. Uropod 3 (Fig. 13 G), 1 st article of ramus with 1 – 2 fine setae, 2 nd article minute. Telson (Fig. 13 G) without setae. Female (based on allotype, 4.1 mm). Gnathopod 1 (Fig. 13 H, H 1) small, weakly chelate; coxa rounded posterodistally; basis slender, with 2 long setae on posterior margin; merus and carpus setose posteriorly; propodus projected posterodistally, projection with a pair of small robust setae, palm almost straight, distal part of posterior margin setose; dactylus narrow, weakly curved. Gnathopod 2 (Fig. 13 I, I 1) strongly chelate; coxa square posterodistally, gill absent; basis slightly curved anteriorly; carpus 0.7 times as long as propodus; distal end of propodus with a pair of minute robust setae; tip of dactylus curved. Pereopods 5 and 6 (Fig. 14 A, B) almost same as those of holotype, but meri slender. Pereopod 7 (Fig. 14 C) almost same as that of holotype, but basis shorter and anterodistal corner not protruded. Variation of male with growth. Paratype, 2.4 mm (OMNH-Ar- 7722): gnathopod 1 (Fig. 14 D) almost same as that of holotype; pereopods 5 and 6 (Fig. 14 E, F), bases shorter and meri narrower than those of holotype; pereopod 7 (Fig. 14 G), basis shorter than that of holotype, anterodistal corner not protruded. Paratype, 6.0 mm (OMNH-Ar- 7723): gnathopod 1 (Fig. 14 H), palm with 4 obtuse processes; pereopods 5 – 7 almost same as those of holotype.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE3FFFD9688FACE4B170A6B.taxon	etymology	Etymology. From the Latin latus (= broad) and quintus (= the fifth), referring to the wide merus of male pereopod 5.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE3FFFD9688FACE4B170A6B.taxon	discussion	Remarks. This new species is characterized by the male pereopod 5 with expanded merus. Seven Seba species have expanded meri in all of male pereopods 5 – 7: Seba aloe, S. antarctica Walker, 1906, S. chiltoni, S. gloriosae Ledoyer, 1986, S. hirsuta Ledoyer, 1978, S. saundersi, and S. subantarctica Schellenberg, 1931 (Walker, 1907; Schellenberg, 1931; Karaman, 1971; Griffiths, 1975; Ledoyer, 1978, 1986; Moore, 1987). However, there is no other species having such a wide merus only in pereopod 5. Habitat. Mud or sandy-mud bottom, 25 – 31 m deep.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFE3FFFD9688FACE4B170A6B.taxon	distribution	Distribution (Fig. 5). Japan: Kata Bay and Owase Bay in Mie Prefecture.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFF9FFFF9688FC6D4C4F09F0.taxon	materials_examined	Material examined. Holotype: male, 2.7 mm (OMNH-Ar- 7725), off Tsuiura in Saeki City, Oita Prefecture (33 ° 03 ' 00 '' N, 131 ° 55 ' 41 '' E), 5.5 – 7 m deep, surface and / or inside of wooden test piece, 4 March 2008 (2 years after fitting on concrete block), coll. Oita Prefectural Agriculture, Forestry and Fisheries Research Center, Fisheries Research Institute. Allotype: female, 2.7 mm (OMNH-Ar- 7726), same data as holotype. Paratypes: 3 males, 2.9, 2.8, 2.5 mm (OMNH-Ar- 7727 – 7729) and 1 female, 2.5 mm (OMNH-Ar- 7730), same data as holotype.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFF9FFFF9688FC6D4C4F09F0.taxon	description	Description. Male [based on holotype, 2.7 mm, and paratype, 2.9 mm (OMNH-Ar- 7727) for labrum, maxilla 1 and epimeral plates]. Body (Fig. 15) relatively slender, urosomites 2 and 3 coalesced, eyes absent. Antenna 1 (Fig. 16 A), ratio of peduncular articles 1 – 3 1: 1.2: 0.4, ventrodistal corner of article 1 with 2 penicillate setae, lateral surface with 3 penicillate setae, laterodistal edge of article 2 with penicillate seta; accessory flagellum present, with 2 articles; primary flagellum with 5 articles, distal ends of articles 1 – 3 with 1, 2 and 1 aesthetascs, respectively. Antenna 2 (Fig. 16 B), ratio of peduncular articles 3 – 5 1: 0.6: 0.2, article 3 with 2 lateral, 1 medial, 1 ventral and 2 distal penicillate setae; flagellum with 2 articles. Labrum (Fig, 16 C) pentagonal, without setae. Mandible (Fig. 16 D, E), molar reduced to several spines with fine setae; palp article length ratio in left 1: 3.3: 3, article 3 with 2 apical setae. Maxilla 1 (Fig. 16 G, G 1), inner plate with single apical seta, outer plate with various-typed apical setae, palp with 3 apical setae. Maxilla 2 (Fig. 16 H), inner plate with 3 simple setae, outer plate with 4 plumose setae apically. Maxilliped (Fig. 16 I), inner plate with 1 long and 1 short robust setae, outer plate with 2 medial and 1 apical robust setae; palp article 3 with several mediodistal setae, medial surface of article 4 pectinate. Gnathopod 1 (Fig. 17 A, A 1) small, weakly chelate; coxa rounded posterodistally; basis slender, with long seta on posterodistal margin; merus and carpus each with a few posterior setae; propodus projected posterodistally, projection with a pair of small robust setae, palm with 1 triangular and 2 obtuse processes, middle part of posterior margin setose; dactylus narrow, weakly curved. Gnathopod 2 (Fig. 17 B, B 1) large, strongly chelate; coxa square posterodistally, gill absent; basis broadened distally, curved anteriorly; carpus short, 0.4 times as long as propodus; propodus stout, protruded posteroproximally, distal end of propodus with a pair of minute robust setae; tip of dactylus curved. Pereopods 3 and 4 (Fig. 17 C, D) slender, posterodistal corners of coxae square. Pereopod 5 (Fig. 17 E), coxa bilobed; basis oval; merus slightly expanded; carpus short, 0.6 times as long as propodus. Pereopod 6 (Fig. 17 F, F 1), coxa bilobed, anterior lobe small; basis wide, protruded posterodistally; merus extremely expanded, with many robust setae on posterior margin; carpus short, 0.6 times as long as propodus. Pereopod 7 (Fig. 17 G), coxa triangular; basis ovoid, greatly expanded posterodistally, posterior margin serrate, proximal part of medial surface with several setae; merus relatively narrow; carpus short, about half length of propodus. Epimeral plates 2 and 3 (Fig. 17 H) slightly drawn out posteroventrally; ventral margins of plates 1 – 3 with 1, 1 and 3 lateral spines, respectively. Pleopods (Fig. 18 D – F) long, pleopod 3 shortest; peduncles each with 2 coupling hooks and a few plumose setae; outer and inner rami each with 5 and 4 articles, respectively. Uropod 1 (Fig. 18 A), peduncle longer than both rami, with 1 dorsal and 2 distal robust setae; outer ramus shorter than inner, both rami bare. Uropod 2 (Fig. 18 B), peduncle shorter than that of uropod 1, with 2 distal robust setae; outer ramus shorter than inner, both rami each with dorsal robust seta. Uropod 3 (Fig. 18 C, C 1), 1 st article of ramus with 1 – 2 fine distal setae, 2 nd article minute. Telson (Fig. 18 C) with a pair of distal setae. Female (based on allotype, 2.7 mm). Gnathopod 1 (Fig. 18 G, G 1) small, weakly chelate; coxa rounded posterodistally; basis slender, with 2 long setae on posterior margin; merus and carpus each with several posterior setae; propodus projected posterodistally, projection with a pair of small robust setae, palm with indistinct process posteriorly, posterior margin setose in the middle; dactylus narrow, weakly curved. Gnathopod 2 (Fig. 18 H, H 1) strongly chelate; coxa roundish square posterodistally, gill absent; basis slightly curved anteriorly; carpus short, 0.3 times as long as propodus; distal end of propodus with a pair of minute robust setae; tip of dactylus curved. Pereopods 5 – 7 (Fig. 18 I – K) almost same as those of holotype, but bases of pereopods 6 and 7 narrower and meri of pereopods 5 – 7 more slender.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFF9FFFF9688FC6D4C4F09F0.taxon	etymology	Etymology. From the Latin latus (= broad) and sextus (= the sixth), referring to the expanded merus of male pereopod 6.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFF9FFFF9688FC6D4C4F09F0.taxon	discussion	Remarks. This new species is characterized by the broadly expanded merus of male pereopod 6, and there is no other species having such a merus only in pereopod 6. Habitat. Submerged wood, 5.5 – 7 m deep.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
2E1787DDFFF9FFFF9688FC6D4C4F09F0.taxon	distribution	Distribution (Fig. 5). Japan: off Tsuira in Oita Prefecture.	en	Ariyama, Hiroyuki (2009): Four species of the genus Seba from Japan, with descriptions of two new species (Crustacea: Amphipoda: Sebidae). Zootaxa 2159: 44-68, DOI: 10.5281/zenodo.188912
