taxonID	type	description	language	source
AD4D87CDFFFE8633FF08FB9DFD91F860.taxon	type_taxon	Type genus. Neopleustes Stebbing, 1906: 311. — Gurjanova 1951: 641. — Gurjanova 1972: 133, 163. — Barnard & Karaman, 1991: 649. — Hendrycks & Bousfield 2004: 94. Type species. Amphitoe puchella Krøyer, 1845. Genera. Hendrycksopleustes gen. nov., Neopleustes Stebbing, 1906, Shoemakeroides Hendrycks & Bousfield, 2004.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFFE8633FF08FB9DFD91F860.taxon	diagnosis	Diagnosis (from Hendrycks & Bousfield 2004 with additions). Body usually dorsally carinate or mucronate. Urosome 2 occluded or not dorsally. Rostrum medium, extending beyond head lobe, less often short. Antenna 1, peduncular segment 1 not produced anterodistally. Lower lip usually broad, shallow. Mandibular molar reduced, non-triturative; left lacinia multidentate, right lacinia lacking; raker setae normal, slender; palp large. Maxilla 1, outer plate with 9 apical strong pectinate setae (spine-like setae), inner plate with 1 – 2 setae. Maxilla 2, inner plate with 1 – 2 inner margin stout setae. Maxilliped plates short; palp slender (less often medium wide), segment 3 variously produced distally; dactylus slender, pectinate. Coxal plates 1 – 4 medium, deepening gradually posteriorly; coxal plates variously with posterodistal cusps; coxal plate 1 not markedly bent forwards; coxal plates 5 and 6 posterolobate. Coxal gills medium, sac-like, lacking on pereopod 7. Pereopods 1 and 2 (gnathopods) typically subsimilar, weak to srong, or unlike and slightly sexually dimorphic, often powerfully subchelate; propodal palms with triangular median tooth; meral posterodistal tooth lacking or not; carpus usually elongate (less often short), lobe shallow (less often deep). Pereopods 5 – 7 subequal in size and form. Epimeral plates 2 and 3 variable, hind corner usually produced. Uropod 1 with distolateral peduncular spine-like seta. Telson keeled proximally, apex rounded.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFFE8633FF08FB9DFD91F860.taxon	distribution	Distribution. Marine waters of arctic and boreal parts of Northern hemisphere.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFFE8633FF08FB9DFD91F860.taxon	discussion	Remarks. Subfamily Neopleustinae is closed to Parapleustinae Bousfield & Hendrycks, 1994 but differs in its well developed, often keeled, rostrum, dorsal body processes, large mandibular palp, unspecialized mandibles raker setae; processiferous palp segment 3 of maxilliped, multicuspate coxal plates 1 – 3, by produced posterior corner of epimeral plates 1 & 3, and midventrally keeled telson (Bousfield & Hendrycks, 1994, 1995; Hendrycks & Bousfield, 2004). New genus Hendrycksopleustes has a number of features that bring it closer to the Parapleustinae subfamily: short rostrum, palp medium width, size and shape of pereopods 1 & 2 (gnathopods 1 & 2). Such features as developed dorsal carination, large palp of mandible, form of coxal plate 1, multicuspate coxal plates 1 – 3, and especially processed hind corner of epimeral plates 2 & 3, make it possible to attribute this genus to the subfamily Neopleustinae. Thus, the genus Hendrycksopleustes gen. nov. occupies an intermediate position between the subfamilies Neopleustinae and Parapleustinae, and tentatively placed as an aberrant form within the Neopleustinae that may be transitional to the Parapleustinae.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF8863DFF08F8ECFC6CFCAC.taxon	description	Figures 1 l, 2 h, n, w, ae, 3 h, 4 l, 5 k, 6 – 11	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF8863DFF08F8ECFC6CFCAC.taxon	type_taxon	Type species. Hendrycksopleustes neimanii sp. nov. Species. Hendrycksopleustes neimanii sp. nov. from the shelf of north-eastern Sakhalin Island (Sea of Okhotsk).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF8863DFF08F8ECFC6CFCAC.taxon	diagnosis	Diagnosis. Body strongly carinated dorsally from pereon segment 6 to pleon segment 2, pleon segment 3 with low ridge. Urosome segment 2 not occluded dorsally. Head without anterodorsal crest. Rostrum short. Anterior head lobe subqadrate. Eyes medium, ellipsoid. Antenna 1 much longer than antenna 2; segments 1 and 2 long, without anterodistal peduncular process and with small posterodistal peduncular process; accessory flagellum minute, scalelike. Antenna 2, peduncular segments 4 and 5 long, subequal, with apical setae only. Upper lip notched apically, lobes slightly asymmetric. Lower lip, outer lobes rounded, steeply angular, widely separated by flat inner lobes. Mandible, molar small, conical, with small conical wart at the axis, and with microsetae, without triturating surface; left lacinia mobilis 10 - dentate, right lacinia lacking; raker setae 15 – 16, slender; incisors 8 - dentate; palp segment 3 with 12 D setae and with 4 medium length E setae. Maxilla 1, inner plate with 1 – 2 setae, palp with an apical row of 5 – 7 stout conical setae and with subapical row of 5 – 6 thin setae. Maxilla 2, inner plate with long subapical inner marginal seta and with numerous apical setae. Maxilliped, inner plate broadened, with 5 button spineformes setae; outer plate short; palp large, segments 1 – 3 broadened, segment 4 slender, slightly cirved. Coxal plates 1 – 4 medium, strongly increasing in depth from 1 to 3. Coxal plate 1 hatched-shaped. Coxal plates 2 and 3 rounded distally. Hind corners of coxae 1 – 3 each with 2 or 3 small cusps. Coxa 5 and 6 posterolobate. Pereopods 1 and 2 (gnathopods 1 and 2) powerful, similar in form and size, not sexually dimorphic; carpus short, with distinct narrow carpal lobe; propodus long, inflated; palmar margin long, vertical; posterior margin indistinct; dactylus long, but shorter than palmar margin. Pereopods 3 and 4 slender, medium long, dactylus medium in length. Pereopods 5 – 7, basis broadened, rounded behind, hind margin minutely serrate. Pleon plates 1 – 3, hind corners produced, acuminate. Uropod 1, peduncle with distolateral spine, peduncle about as long as inner ramus, outer ramus slightly shorter. Uropod 2, outer ramus distinctly shorter. Uropod 3 slender, outer ramus not more than 3 / 5 the length of inner ramus. Telson linguiform, longer than wide, keeled slightly proximally, paired notch and setae prominent, lateral margins with few short setae. Marsupial plates 2 – 4 broad, with long setae; plate 5 narrow. Without sexual dimorphism.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF8863DFF08F8ECFC6CFCAC.taxon	distribution	Distribution. The shelf of north-eastern Sakhalin Island, Sea of Okhotsk. Relationships: Hendrycksopleustes gen. nov. conforms essentially with the diagnosis of the subfamily Neopleustinae in the dorsally carinated body, strong peduncle of antenna 1, by the structure of mouthparts, especially of the mandible, by the hatched-shaped coxal plate 1. It differs mainly in the short rostrum, distal process on segment 3 of the palp of maxilliped indistinct, pereopods 1 and 2 (gnathopods 1 and 2) powerful, similar in form shape and size. Hendrycksopleustes differs from the genus Neopleustes Stebbing, 1906 in the short rostrum, in the setacea of inner plate of maxilla 1 (2 setae mainly in Hendrycksopleustes and single seta in Neopleustes), and large gnathopods, in which propods are inflated and subsimilar in form, and the carpus shortened, with narrow carpal lobe. Hendrycksopleustes differs from Shoemakeroides Hendrycks & Bousfield, 2004 by the following combination of character states: inner plate of maxilla 1 with 2 setae mainly; propodus of gnathopods 1 and 2 large, inflated, subsimilar in size and forms, carpus shortened, with narrow carpal lobe; basis of pereopods 5 – 7 broadened, rounded behind.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF8863DFF08F8ECFC6CFCAC.taxon	etymology	Etymology: The genus Hendrycksopleustes is named in honor of the famous Canadian carcinologist E. A. Hendrycks, and with the genus name Pleustes. The name is masculine in gender.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	description	Figures 1 l, 2 h, n, w, ae, 3 h, 4 l, 5 k, 6 – 11, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	diagnosis	Diagnosis. With the characters of the genus. Body segments strongly carinated dorsally from pereon segment 6 to pleon segment 2, pleon segment 3 with sloping low ridge dorsally. Rostrum short, about 0.1 times as long as peduncular segment 1 of antenna 1, apex acute. Antenna 1, segment 2 of peduncle with small rounded anterodistal process, accessory flagellum minute, scale-like; flagellum with 71 articles, length about 4.6 x peduncle. Lower lip, outer lobes rounded, widely spread. Mandible, molar weak and without a medial molar seta; palp segment 3 subequal to segment 2, segment 2, inner margin setose; segment 1 without setae. Maxilla 1, inner plate with 2 plumose apical setae, rarely with single seta; outer plate with 9 strong pectinate setae (spine-like setae). Maxilliped, inner plate reaching the middle of outer plate basis; outer plate reaching about 0.2 x length of palp segment 2; palp segment 1 subequal in legth to segments 2 and 3 each; dactylus slender, slightly curved and slightly shorter than palp segment 3. Coxal plate 1 – 3 medium; coxal plate 4 much broader, deeply excavated posteroproximally; coxal plates 5 – 6 posterolobate, posteriorly rounded, coxal plate 7 trapezoidal, with rectangular posterodistal angle. Pereopod 1, merus with posterodistal tooth, palmar margin with medial tooth, with a row of 5 strong spineformes setae along posterior part and with 5 transversal clusters of posterodistal strong setae (spines). Pereopod 2, carpal lobe long, merus with posterodistal tooth, palmar margin with medial tooth and with a row of 6 – 7 strong spineformes setae along posterior part and with 5 transversal clusters of posterodistal strong setae (spines). Pereopods 5 – 7, dactylus medium in length, 0.46 – 0.49 times as long as propodus. Epimeral plates 1 – 3, posteroventral corner with acute process. Male similar to female.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	materials_examined	Type material. Holotype female, 12 mm, Х 53857 / Cr- 2402, Sea of Okhotsk, Far East of Russia (53 ° 45 ′ 37.010 N 143 ° 37 ′ 57.186 E, 104 m), pebbles with sands and silt, M. G. Rogotnev, 29 August 2018. Paratypes: 1 male, 8.8 mm, Х 53858 / Cr- 2403, with same data as holotype; 1 female, 13.3 mm, Х 53859 / Cr- 2404, with same data as holotype; 3 females, Х 53860 / Cr- 2405, with same data as holotype. Type locality. The eastern coast of Sakhalin Island, Sea of Okhotsk, Far East of Russia (53 ° 45 ′ 37.010 N 143 ° 37 ′ 57.186 E, 104 m).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	description	Description. Female (12 mm). Vital body color unknown; color in alcohol almost colourless, uniformly pale yellow. Body medium, with the carination characters of the genus. Head: shorter than pereonites 1 and 2 combined, without anterodorsal crest, rostrum about 0.1 times as long as peduncular segment 1 of antenna 1; eyes medium, ellipsoid, pigmented; anterior head lobe prominent, truncated, lower margin rounded. Antenna 1: long, nearly 80 % of body length; flagellum bearing 71 articles; peduncle article 1 is 1.25 times as long as the length of article 2, with a few simple setae at the distal corner of posterior margin, without anterodistal process, article 3 is 1 / 3 times the length of article 2; accessory flagellum reduced. Antenna 2: flagellum with 33 articles; peduncle articles 5 slightly shorter than article 4, articles 1 – 3 combined subequal to article 4; article 2 with long posterodistal protrusion, subequal to article 3 length. Labrum: apically bilobate and asymmetrical, without setae. Mandible: molar small, conical, with small conical wart at the axis, and with microsetae, without triturating surface and without a medial molar plumose seta; palp 3 - articulate, article 1 of palp without setae, palp segment 2 with a row of 13 – 16 simple setae (D- 2 setae), palp segment 3 with posterior row of 12 specific plumose D 3 - setae, with group of 4 medium length simple distal E 3 - setae. Labium: inner and outer lobes pubescent. Maxilla 1: inner plate short, rounded distally, with 2 (less often one) plumose setae apically; outer plate subquadrate, apically with 2 rows of 9 strong comb setae; palp 2 - articulate, article 2 with a distal row of thin simple setae at the outer margin and with a subapical row of 5 – 6 simple setae, apical margin of article 2 of with 5 – 7 stout spine-like setae. Maxilla 2: inner plate with one strong plumose seta on the inner margin. Maxilliped: inner plates short, fully cleft, with 5 button spineformes setae (Watling type II. A 3) (Watling 1989) at the truncated apex; outer plate short, subrounded apically, inner margin with submarginal row of simple setae, apex with 3 strong cuspidate setae; palp 4 - articulate, the percentage of total length of the articles of the palp 21 – 23 % (article 1), 25 – 26 % (article 2), 29 % (article 3) and 23 – 25 % (article 4); article 4 (dactylus) slender, slightly curved. Pereon: Pereopod 1 (gnathopod 1): coxa medium depth, with central ventral rounded angle, with 3 small posterodistal cusps; basis linear, with dense row of simple setae along anterior margin and with rare simple setae along posterior margin; merus with a tuft of 2 simple setae at the border of 1 / 2 of posterior margin, distal margin with a dense row of long simple setae; carpus 0.4 times as long as propodus, posterior lobe medium, with a dense row of simple setae along posterior margin; propodus almond-shaped, 2.3 times as long as wide, palmar margin subvertical, with medial tooth at the border of anterior 1 / 6 of palmar margin length, posterior margin indistinct; dactylus curved, 5 / 6 times as long as palmar margin of propodus. Pereopod 2 (gnathopod 2): coxa deep, rounded down, with 2 posterodistal cusps; basis linear, with a row of rare short simple setae anteriorly and with 3 tufts of simple setae in the distal half of posterior margin; merus with an acute tooth at the posterior angle, with a few simple setae at the border of 1 / 2 of posterior margin and with a tuft of simple setae near the base of posterodistal tooth, distal margin truncated; carpus short, 0.4 times as long as propodus, posterior lobe narrow and long, with a dense row of simple setae along posterior margin and with a row of strong cuspidate setae at the posterior part of distal margin; propodus almond-shaped, 2 times as long as wide, palmar margin subvertical, with medial tooth at the border of anterior 1 / 6 of palmar margin length, posterior margin indistinct; dactylus curved, 0.9 times as long as palmar margin of propodus. Pereopod 3: coxa deep, 1.9 times as long as wide, rounded distally, with 1 – 2 posterior teeth; leg slender; basis linear, with rare short setae along anterior and posterior margins; merus 1.5 times as long as carpus, produced slightly forwards along anterior margin of carpus, with 3 – 5 groups of few simple setae along anterior margin and with 5 clusters of few simple setae along posterior margin; propodus long, 1.36 times as long as carpus, with 7 – 8 groups of short strong cuspidate setae along posterior margin; dactylus short, 0.46 times as long as propodus. Pereopod 4: coxa 1.14 times as long as wide, narrowed and rounded distally, with deep excavation posteromarginally; basis to dactylus as for pereopod 3. Pereopod 5: coxa antero- and posterolobate, with rounded ventral front margin, posterior lobe rounded; basis with posterior wing, width 0.68 times length, anterior margin with 7 – 8 groups of 1 – 2 short strong cuspidate setae, posterior margin convex, crenulated; merus slightly produced forwards along posterior margin of carpus, with 5 – 6 cuspidate simple setae along anterior and posterior margins each; the leg from carpus to dactylus missing. Pereopod 6: coxa posterolobate, with oblique front margin, posterior lobe subovate, pulled back and down; basis with posterior wing, width 0.71 – 074 times as length, anterior margin with 7 – 8 groups of 1 – 2 short strong cuspidate setae, posterior margin convex, crenulated; merus slightly produced forwards along posterior margin of carpus, with 5 – 6 cuspidate simple setae along anterior and posterior margins each; carpus 0.69 times as long as merus, with 4 clusters of strong cuspidate setae along anterior margin; propodus linear, 1.22 times as long as carpus; dactylus short, 0.46 times as long as propodus, weakly curved. Pereopod 7: coxa trapezoidal; basis with posterior wing, width 0.7 times as length, anterior margin with 6 – 7 groups of 1 – 2 short strong cuspidate setae, posterior margin convex, crenulated; merus slightly produced forwards along posterior margin of carpus, with 5 – 6 cuspidate simple setae along anterior and posterior margins each; the leg from carpus to dactylus missing. Coxal gills 2 – 6, ovate. Coxal gill 6 smaller than gill 5. Pleon: Epimeral plates: plate 1 rounded triangular, posterior corner with small acute tooth, posterior margin convex, lower margin with 3 strong cuspidate setae along anterior half; plate 2 with acute posteroventral process, ventral margin with 5 spine-like cuspidate setae in anterior 2 / 3, posterior margin convex; plate 3 with long acute posteroventral process, posterior margin convex, ventral margin straight with 5 spine-like setae. Pleopods: normal; inner ramus slightly shorter than outer ramus, coupling basis of inner ramus with 5 – 6 specific stout two-pointed plumose setae along inner margin (6 setae on pleopod 1, 5 setae on pleopods 2 and 3). Uropod 1: peduncle 1.22 times as long as outer ramus; outer ramus the shorter, 0.91 times as long as inner ramus. Uropod 2: inner ramus 1.8 times as long as peduncle, outer ramus the shorter, 0.66 times as long as inner. Uropod 3: inner ramus 3 times as long as peduncle, with acute and non-spinose apex; outer ramus about 0.6 times as long as inner; outer ramus with a row of 5 – 6 small spine-shaped setae along lateral and medial margins each, with acute and non-spinose apex. Telson: (Fig. 6 i) linguiform, apically rounded, length about 1.58 x width, with proximal ventral keel, plumose marginal penicillate setae are absent. Male similar to female.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	etymology	Etymology. Named in honor of famous Russian oceanographer Victor G. Neiman. The name is masculine in gender.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	biology_ecology	Ecology. H. neimanii was found at the depth of 104 m on pebbles sediments with sands and silt. Females with eggs in marsupium were detected in the type locality in August.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFF58625FF08FC4FFBD9FE38.taxon	distribution	Distribution. The north-east shelf of Sakhalin Island, Sea of Okhotsk (Fig. 22).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFED8624FF08FE3BFD2CFC80.taxon	type_taxon	Type species. Amphitoe pulchella Krøyer, 1845: pl. 10. Species. Including the new subspecies described here, Neopleustes contains 7 species + 2 subspecies (Gurjanova 1951; Hendrycks & Bousfield 2004; http: // www. marinespecies. org; Sars 1877, 1885, 1886; new data): N. boecki boecki (Hansen, 1887), N. boecki pacifica ssp. nov., N. carinatus Margulis, 1963, N. columbianus Hendrycks & Bousfield, 2004, N. euacanthoides Gurjanova, 1972, N. euacanthus (Sars, 1877), 1972, N. kussakini (Budnikova, 1995), N. pulchellus pulchellus (Krøyer, 1845), N. pulchellus asiaticus ssp. nov.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFED8624FF08FE3BFD2CFC80.taxon	diagnosis	Diagnosis (from Hendrycks & Bousfield 2004 with additions). Body middorsally carinate or mucronate, rarely smooth. Rostrum medium to strong, often keeled. Antenna 1 elongate, often longer than body. Antenna 2 distinctly shorter than antenna 1. Lower lip, outer lobes oblique, widely separated by low flat inner lobes. Mandibular molar process small, thumb-like, without triturating surface; left lacinia 7 – 10 - dentate; palp powerful, length exceeding by 2 – 3 times that of the mandibular body. Maxilla 2, inner plate, inner marginal seta set apart basally from apical setae. Maxilliped, inner plate truncate, with 3 – 7 apical button spine-like setae; outer plate slender; palp segments slender; segment 3 with short, outer distal conical projection, dactylus articulated from its medial side. Coxal plates 1 – 4 medium, increasing in size posteriorly; coxal plate 1 not bent forwards distally, posterodistally cuspate. Coxal gills medium, sac-lake. Pereopods 1 and 2 (gnathopods 1 and 2) weak, subchelate, subsimilar; posterodistal tooth of merus weak or lacking; carpus elongate, shorter than propodus, posterodistal lobe shallow; propodus with short, oblique, weakly toothed palmar margin; posterior margin setose. Pereopods 5 – 7 regular, homopodous, bases usually convex behind. Epimeral plates 2 and 3, posterior corners acute, produced. Uropod 1 with distolateral peduncular spine-like seta; rami subequal. Telson with proximal keel.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFED8624FF08FE3BFD2CFC80.taxon	distribution	Distribution. Marine waters of arctic and boreal parts of Northern hemisphere.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFED8624FF08FE3BFD2CFC80.taxon	discussion	Remarks. Stebbing (1906) resurrected Amphitoe pulchella Krøyer, 1845 as the type species of Neopleustes Stebbing, 1906, that had long been synonymized within genera Pleustes Spence Bate, 1858 and Paramphithoe Bruzelius, 1859. The main features of the genus after Stebbing (1906) were features of structure of the upper lip (“ assymmetrically bilobed, incision oblique ”), mandible (“ molar weak, palp very large ”), maxillae 1 & 2 (“ nearly as in Pleustes ”), maxilliped (“ dififering by joint 3 of palp distally attenuated, 4 th spiniform ”), pereopods 1 and 2 (“ Gnathopods 1 and 2 feeble to moderately strong ”). In the description of Stebbing (1906) the genus Neopleustes included representatives of modern genera Neopleustes, Parapleustes Buchholz, 1874, Incisocalliope J. L. Barnard in J. L. Barnard & Reish, 1959. Gurjanova (1951, 1972) adhered to the characteristics from the diagnosis of Stebbing (1906). Barnard & Karaman (1991) changed the diagnosis of the genus Neopleustes. It was added new main features — the dorsal armament of body, rostrum, coxal plates 1 – 4 and structure of uropos 1 – 3: “ Body smooth or keeled. Rostrum moderately long ”; “ Coxae 1 – 4 ordinary, or slightly acuminate distally, especially coxa 1 ”; “ Rami of uropods 1 – 3 lanceolate, outer shortened, peduncle of uropod 3 without tooth ”. Hendrycks & Bousfield (2004) added new characteristics to the diagnosis of the genus: the description of lower lip, maxilla 2, epimeral plates (see Diagnosis). G. Sars (1877) described Pleustes euacanthus sp. nov., which differed from Pleustes pulchello (now Neopleustes pulchellus (Krøyer, 1845 )) in total carination of pereon and pleosome segments. G. Sars later (1885) redescribed this species as Paramphithoe euacantha. Hansen (1887) suggested that the structural features of P. euacantha fit within the morphological variability of the closely related species Paramphithoe pulchella, and combined it with the latter species. G. Sars (1895) supported the opinion of Hansen (1887) and referred P. euacantha to P. pulchella. Subsequently, the opinions of researchers were divided. A number of authors (Barnard & Karaman 1991, Hendrycks & Bousfield 2004, Stebbing 1906), following Hansen (1887) and G. Sars (1895), considered Neopleustes euacanthus as one of the morphological variations of N. pulchellus (Krøyer, 1845) and did not distinguish it as a separate species. Other authors considered it a variation of N. pulchellus (Krøyer, 1845) (N. pulchellus (Krøyer, 1845) var. euacanthus (G. Sars, 1876) (Gurjanova 1951) or a subspecies of N. pulchellus euacanthus (G. Sars, 1876) (Wesławski 1990). In accordance with the graphic image of G. Sars (1885), N. euacanthus differs from N. pulchellus not only in dorsal carination, but also in the structure of coxal plates 1 and 2, which have a rounded lower margin. Our studies have shown that the number of dorsal teeth and the shape of coxal plates are persistent features within the genus Neopleustes. Therefore, in this article, the species status is restored for N. euacanthus. Relationships: Neopleustes differs from Shoemakeroides mainly in the more srongly developed rostrum, more strongly cuspate coxal plates 1 – 3, and smaller pereopods 1 and 2, in which the propodus are subsimilar in form, and elongate carpus (Hendrycks & Bousfield 2004).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8624FF08FCA3FCD6FAB7.taxon	description	Figures 1 a, 2 a, 4 a, 5 a, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8624FF08FCA3FCD6FAB7.taxon	distribution	Distribution: Known from the Arctic Ocean, from the coast of Norway, Greenland and the East Siberian Sea from a depth of 9 – 113 m (Gurjanova 1951; Hansen 1887; Sars 1895; Stebbing 1906). Recorded from the coastal waters and shelf of Sea of Japan and Sea of Okhotsk in depth range of 9 – 55 m on pebbles, sand and shells (Dzhurinskyi 2013; Margulis 1963).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8624FF08FCA3FCD6FAB7.taxon	discussion	Remarks. Probably individuals from the lists of Margulis (1963) and Dzhurinskyi (2013) belong to the new subspecies Neopleustes boecki pacifica ssp. nov. (see below).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	description	Figures 1 b, 2 b, I, p, x, 3 a, 4 b, 5 b, 12 – 13, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	diagnosis	Diagnosis. Female (9 mm). Body, pereon segments 1 – 6 without carination, strongly carinated posteriorly from segment 7 to pleon segment 2, pleon segment 3 with sloping low ridge dorsally. Pereonal and pleonal segments with submedial and sublateral groups of plumose aesthetascs dorsally. Head with anterodorsal crest. Rostrum medium, about 0.5 times as long as peduncular segment 1 of antenna 1, apex acute; anterior head lobe rounded, lateral cephalic lobe very deeply recessed sinus, anteroventral corner acute. Eye large, subrounded, pigmented. Antenna 1 very long, slightly shorter than body length; peduncular segment 1 elongate and strong, equal to segments 2 and 3 together; flagellum length about 4 times as long as peduncle, with 65 articles, articles posterodistally with aesthetascs and short setae. Antenna 2 is 0.5 times as antenna 1 length, flagellum with 43 articles. Upper lip apically bilobate and asymmetrical. Lower lip, outer lobes rounded, widely spread. Mandible, molar weak, bare, without a medial molar seta; incisor margins with 7 – 9 teeth; left lacinia 10 - dentate, right lacinia absent; accesory spine rows with 7 – 9 raker setae; palp very large; palp segment 3 subequal to segment 2, inner margin lined with strong pectinate D setae, apex with 2 long and one medium strong pectinate E setae; segment 2, inner margin with few setae only; segment 1 without setae. Maxilla 1, inner plate with single plumose apical seta; outer plate with 9 slender pectinate setae (spine-like setae); palp extending beyond outer plate, apex subtruncate, with a row of 7 cuspidate setae (Watling, 1989: type IIA 3) and with a row of 7 subapical thin setae. Maxilla 2, inner plate slightly shorter and broader than outer plate; inner margin with single strong plumose seta. Maxilliped, inner plate very short, not reaching the basal article of palp, apex subtruncate, with 2 – 3 button setae (Watling, 1989: type IIA 4) and a few slender setae; outer plate short, reaching about 0.25 x length of palp segment 2, apex narrowly subtruncate; palp narrow, segment 2 subequal in legth to segment 3; dactylus slender, slightly curved and slightly shorter than palp segment 3, the distal process of palp segment 3 is present buy not conspicuous. Coxal plates 1 – 3 posteroventrally minutely multi-cuspate, lower margins rounded; coxal plate 4 much broader, deeply excavated posteroproximally, rounded below; coxal plates 5 – 6 broadly posterolobate, posteriorly roundly subquadrate, coxal plate 7 trapezoidal, rounded anteroventrally, with rectangular posterodistal angle. Coxal gills relatively small, sac-like. Pereopods 1 and 2 (gnathopods 1 and 2) small, weakly subchelate, subsimilar. Pereopod 1, basis with rare anterior setae, carpus long, about 0.8 times as long as propodus, posterior lobe broad, shallow; propodus subrectangular, narrow, palm oblique, with small mid-palmar tooth, with 2 clusters of spine-like setae; posterior margin with 2 – 3 groups of setae. Pereopod 2, merus without posterodistal tooth, carpus long, about 0.71 times as long as propodus, carpal lobe as in pereopod 1, palmar margin with medial tooth and with 2 clusters of strong posterodistal spineformes setae, posterior margin with 4 transversal setae clusters. Pereopods 3 – 4 medium strong; basis linear, with short setae along anterior and posterior margins; merus anterodistally produced, acute; carpus 1.4 times shorter than merus, posterior margin with 4 groups of strong spine-like setae; propodus 1.2 – 1.4 times as long as carpus, posterior margin with 7 groups of strong spine-like setae; dactylus slender, 0.63 times as long as propodus. Pereopods 5 – 7 closely homopodous in form and size; bases with posterior rounded wing; merus posterodistally produced, acute, anterior margin with 5 – 6 groups of strong spine-like setae, posterior margin with 5 groups of strong setae; carpus 1.4 times shorter than merus, anterior margin with 4 groups of strong spine-like setae; propodus 1.3 times as long as carpus, anterior margin with 6 groups of strong spine-like setae; dactylus medium in length, 0.67 times as long as propodus. Epimeral plates 1 – 3, lower margin with short spine-like setae, posteroventral corners acute, slightly produced, posterior margin minutely serrated. Pleopods regular, coupling basis of inner ramus with 4 specific stout twopointed plumose setae. Uropod 1, peduncle slightly shorter than inner ramus; outer ramus the shorter; margins of peduncle and rami with serially arranged short spine-like setae. Uropod 2, inner ramus 1.7 times as long as peduncle, outer ramus the shorter, 0.63 times as long as inner. Uropod 3, inner ramus 3 times as long as peduncle, with a row of 6 – 7 small spine-shaped setae along lateral and medial margins each, with acute and non-setae apex; outer ramus about 0.6 times as long as inner; outer ramus with a row of 5 – 6 small spine-shaped setae along lateral and medial margins each, with acute and non-setae apex. Telson linguiform, apically rounded, length about 1.65 x width, with proximal ventral keel, with lateral and subapical paired short setae. Male: unknown.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	materials_examined	Type material. Holotype, female, 9 mm, Х 53862 / Cr- 2407, Sea of Okhotsk, Far East of Russia (51 ° 31 ′ N 143 ° 48 ′ 36 E, 88 m), pebbles with sands and silt, 12 October 2017. Paratypes: 1 female, Х 53863 / Cr- 2408, Sea of Okhotsk, Far East of Russia (53 ° 45 ′ 37.010 N 143 ° 37 ′ 57.186 E, 104 m), pebbles with sands and silt, M. G. Rogotnev, 29 August 2018.; 9 females, Х 53864 / Cr- 2409, Sea of Okhotsk, Far East of Russia (54 T; 659116 E, 5205062 N, 5 – 20 m), rocks, 11 July 2019. Type locality. The eastern coast of Sakhalin Island, Sea of Okhotsk, Far East of Russia (51 ° 31 ′ N 143 ° 48 ′ 36 E, 88 m).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	etymology	Etymology. Named after the type locality in Pacific Ocean. The name is masculine in gender.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	biology_ecology	Ecology: Neopleustes boecki pacifica was found at the depth of 88 m on the pebbles with sands and silt bottom in the layer of constant low temperature (- 1.2 — + 0.5 ° C). Female with developed marsupium was found in October. It is found on the shelf of south-eastern Sakhalin Island and in the Gulf of Aniva at a depth of 5 – 20 m on rocky and stony ground.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	distribution	Distribution: The shelf of eastern Sakhalin Island.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFEC8623FF08FAB7FB03F848.taxon	discussion	Remarks. Neopleustes boecki pacifica ssp. nov. is morphologically identical to the nominotypical subspecies Neopleustes boecki (Hansen, 1887) (Gurjanova 1951; Hansen 1887; Hendrycks & Bousfield 2004; G. Sars 1895; Stebbhing 1906). Neopleustes boecki pacifica differs from N. boecki only by the presence of submedial and sublateral groups of plumose aesthetascs dorsally on pereonal & pleonal segments (Figs. 1 b, 12 a).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE8862BFF08FF52FD08FD3C.taxon	description	Figures 1 c, 2 c, j, q, y, 3 b, 4 c, 5 c, 14 – 17, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE8862BFF08FF52FD08FD3C.taxon	diagnosis	Diagnosis. Female (11.4 mm). Body, pereon segments 1 – 7 and pleon segments 1 and 2 without carination, pleon segment 3 with sloping low ridge dorsally. Cephalon, pereonal and pleonal segments with submedial and sublateral groups of simple aesthetascs dorsally. Head without anterodorsal crest. Rostrum small, about 0.2 times as long as peduncular segment 1 of antenna 1, apex acute; anterior head lobe rounded, lateral cephalic lobe deeply recessed sinus, anteroventral corner acute. Eye large, broadly reniform, light brown, with light edging. Antenna 1 destructed; peduncular segment 1 elongate and strong, 1.8 times as long as segment 2. Upper lip apically bilobate and asymmetrical. Lower lip, outer lobes oblique elliptical, widely spread. Mandible, molar weak, covered microsetae, without triturative surface and without a medial molar seta; incisor margins with 7 – 9 teeth; left lacinia 10 - dentate, right lacinia absent; accesory spine rows with 8 – 9 raker setae; palp very large; palp segment 3 is 1.2 times longer than segment 2, inner margin lined with 11 – 13 strong pectinate D setae, apex with 2 long pectinate and with 2 medium simple E setae; segment 2, inner margin lined with simple setae; segment 1 without setae. Maxilla 1, inner plate with single plumose apical seta; outer plate with 9 slender pectinate setae (spine-like setae); palp extending beyond outer plate, apex oblique, with a row of 7 – 8 cuspidate setae (Watling, 1989: type IIA 3) and with a subapical row of 6 thin setae. Maxilla 2, inner plate slightly shorter and broader than outer plate; inner margin with single strong plumose seta. Maxilliped, inner plate short, reaching basal article of palp, apex subtruncate, with 7 button setae (Watling, 1989: type IIA 43) and with two cuspidate setae; outer plate short, reaching about 1 / 3 x length of palp segment 2, apex narrowly subtruncate, inner margin with a row of numerous setae; palp narrow, segment 2 subequal in legth to segment 3; dactylus slender, slightly curved and slightly shorter than palp segment 3, the distal process of palp segment 3 present, buy not conspicuous. Coxal plates 1 – 3 posteroventrally with single tooth, lower margins rounded; coxal plate 4 much broader, deeply excavated posteroproximally, rounded below; coxal plates 5 – 6 broadly posterolobate, posteriorly roundly subquadrate, posterior lobe with numerous short simple setae ventrally; coxal plate 7 with oblique anterior margin, rounded posteroventrally. Coxal gills 2 – 6, relatively small, sac-like. Pereopods 1 and 2 (gnathopods 1 and 2) small, weakly subchelate and subsimilar. Pereopod 1, basis with a dense row of anterior setae, carpus long, about 0.87 times as long as propodus, posterior lobe broad, shallow; propodus narrow, with oblique palmar margin, with small mid-palmar tooth, palmar margin with 2 clusters of spine-like setae posteriorly; posterior margin with 4 – 5 groups of setae. Pereopod 2, basis with a rare anterior row of short setae, merus without posterodistal tooth, carpus long, about 0.69 times as long as propodus, carpal lobe as in pereopod 1, palmar margin with medial tooth and with 2 clusters of strong posterodistal spineformes setae, posterior margin with 6 transversal setae clusters. Pereopods 3 – 4 medium strong; basis linear, with dense row of short setae along anterior margin; merus anterodistally produced, acute; carpus 1.4 times shorter than merus, posterior margin with 3 – 4 groups of strong spine-like setae; propodus 1.25 – 1.4 times as long as carpus, posterior margin with 6 – 7 groups of strong spine-like setae; dactylus slender, 0.55 times as long as propodus. Pereopods 5 – 7 closely homopodous in form and size; bases with posterior rounded wing; merus posterodistally produced, acute, anterior margin with 5 – 6 groups of strong spine-like setae, posterior margin with 5 groups of strong setae; carpus 1.3 times shorter than merus, anterior margin with 4 groups of strong spine-like setae; propodus 1.3 times as long as carpus, anterior margin with 5 groups of strong spine-like setae; dactylus medium in length, 0.52 – 0.55 times as long as propodus. Epimeral plates 1 – 3, lower margin with short spine-like setae, posteroventral corners subacute, slightly produced in plate 1, posterior margin without serration. Pleopods regular, coupling basis of inner ramus with 7 specific stout two-pointed plumose setae along inner margin. Uropod 1, peduncle subequal to outer ramus in length; outer ramus the shorter; margins of peduncle and rami with serially arranged short spine-like setae. Uropod 2, inner ramus 1.7 times as long as peduncle, outer ramus the shorter, 0.67 times as long as inner. Uropod 3, inner ramus 3 times as long as peduncle, with a row of 9 – 10 small spine-shaped setae along lateral and medial margins each, with acute and non-spinose apex; outer ramus about 0.56 times as long as inner; outer ramus with a row of 4 small spine-shaped setae along lateral and medial margins each, with acute and non-spinose apex. Telson linguiform, apically rounded, length about 1.53 x width, with proximal ventral keel, with lateral paired short setae. Male: unknown.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE8862BFF08FF52FD08FD3C.taxon	materials_examined	Material. Female, 11.4 mm, Х 53865 / Cr- 2410, Sea of Okhotsk, Far East of Russia (52.15368898 ° N 143.8973123 ° E, 60 m), coarse sand, 23 July 2019. 1 female, 8.4 mm, Х 53866 / Cr- 2411, Sea of Okhotsk, Far East of Russia (52.16004338 ° N 143.886981 ° E, 61.6 m), coarse sand, 27 June 2019; 1 female, 4.9 mm, Х 53867 / Cr- 2412, Sea of Okhotsk, Far East of Russia (52.16004338 ° N 143.886981 ° E, 61.6 m), coarse sand, 27 June 2019. Type locality. Sea of Okhotsk, without indicating the exact location (Margulis 1963).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE8862BFF08FF52FD08FD3C.taxon	biology_ecology	Ecology: N. carinatus was found in the depth interval from 7 (Margulis 1963) to 62 m (own data) on the rocks, stones, pebbles and coarse sand. Females with developed marsupium was found in July.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE8862BFF08FF52FD08FD3C.taxon	distribution	Distribution: The shelf of Sea of Okhotsk.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE8862BFF08FF52FD08FD3C.taxon	discussion	Remarks. N. carinatus differs from other species of the genus Neopleustes by the absence of distinct dorsal teeth on pereon and epimeron (Figs. 1 c, 14 a).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862BFF08FD3FFBACFB2F.taxon	description	Figures 1 d, 2 d, k, r, z, 3 c, 4 d, 5 d, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862BFF08FD3FFBACFB2F.taxon	distribution	Distribution: Known from Pacific coast of Northern America from South-Eastern Alaska to southern British Columbia in depth range of 7 – 71 m on mud (Hendrycks & Bousfield 2004).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862BFF08FD3FFBACFB2F.taxon	discussion	Remarks. Perhaps this species includes individuals from the north-eastern coast of North America (Grand Manan Island, Fundy Bay), which were identified by Holmes (1904) as Paramphithoe pulchella (Krøyer, 1845). Exemplars from Fundy Bay are close in morphology to N. columbianus (especially in dorsal carination) (Holmes, 1904: pl. 8, fig. 1), but differ from the typical description of Krøyer (1845) and Sars (1895) (Fig. 18). However, the lack of own description in Holmes (1904) does not allow us to precisely state this.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862BFF08FACEFCC6F9A3.taxon	description	Figures 1 e, 4 e, 5 e, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862BFF08FACEFCC6F9A3.taxon	distribution	Distribution: Known only from type locality from Bering Sea (55 º 31 ’ 1 ” N 165 º 09 ’ 58 ” E) on pebbles with sand, at 126 m depth (Gurjanova 1972). In our collections it is missing.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862AFF08F942FDD8FE33.taxon	description	Figures 1 f, 4 f, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862AFF08F942FDD8FE33.taxon	distribution	Distribution: Arctic Ocean: Greenland Sea, Norwegian Sea, Barents Sea and Kara Sea in depth range of 2 – 830 m on mud (Gurjanova 1951; G. Sars 1877, 1885, 1886; Stappers 1911; Wesławski 1990).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE3862AFF08F942FDD8FE33.taxon	discussion	Remarks. According to the formula of dorsal carination, it is close to N. euacanthoides. It differs from the latter in the form of coxal plates 1 and 2. Сoxal plates in N. euacanthus are rounded at the lower edge, and these are narrowly pointed in N. euacanthoides.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE2862AFF08F9B2FD67F865.taxon	description	Figures 1 g, 4 g, 5 f, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE2862AFF08F9B2FD67F865.taxon	distribution	Distribution: North-West Pacifica: Sea of Japan, Sea of Okhotsk, Bering Sea in depth range of 80 – 185 m on stones, pebbles, shell, various sands and silt (Budnikova 1995; Budnikova & Bezrukov 2003; Dzhurinskyi 2013). In our collections it is absent.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE2862AFF08F9B2FD67F865.taxon	discussion	Remarks. The distal process of palp segment 3 of maxilliped is present, but not conspicuous (Hendrycks & Bousfield 2004: Tzvetkova, personal communication).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18629FF08FF52FB9DFCA3.taxon	description	Figures 1 h; 2 e, l, s, aa; 3 d, 4 h, 5 g, 22 Amphitoe pulchella Krøyer, 1846: figs. 2 a – r.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18629FF08FF52FB9DFCA3.taxon	distribution	Distribution: Arctic Ocean: circumpolar (Gurjanova 1951; Shoemaker 1955). Western part of North Atlantic (Holmes 1905; Mills 1964; Shoemaker 1930; Wildish & Dadswell 1985) and western sector of North Pacific (Dzhurinskyi 2013; Margulis 1963). In depth range of 20 – 300 m on pebbles, sand and mud.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	description	Figures 1 i, 2 f, m, t, ab, 3 e, 4 i, 5 h, 19 – 21, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	diagnosis	Diagnosis. Male (11.1 mm). Body, pereon segments 1 – 3 without carination, pereon segment 4 with weak carination, strongly carinated posteriorly from pereon segment 5 to pleon segment 2, pleon segment 3 with low tooth dorsally. Head, pereonal and pleonal segments with submedial and sublateral single specific pappose setae dorsally. Head without anterodorsal crest. Rostrum short, about 0.2 times as long as peduncular segment 1 of antenna 1, apex rounded; anterior head lobe rounded, lateral cephalic lobe deeply recessed sinus, anteroventral corner acute. Eye large, subrounded, pigmented, yellow-brown. Antenna 1 destructed; peduncular segment 1 elongate and strong, 1.5 times as long as segment 2. Antenna 2 destructed; peduncular segment 4 elongate and strong, as long as segments 1, 2 and 3 together, segment 3 with strong spine-like seta at the anterodistal angle, segment 4 with short process on inner and outer distal margins each. Upper lip apically bilobate and asymmetrical. Lower lip, outer lobes suboval, widely spread. Mandible, molar weak, tubercle, bare, without a medial molar seta; incisor margins with 8 – 9 teeth; left lacinia 9 - dentate, right lacinia absent; accessory spine rows with 9 raker setae; palp large; palp segment 3 is 1.5 times as long as segment 2, inner margin in the distal 3 / 4 lined with strong pectinate D setae, apex with 3 long and strong pectinate E setae; segment 2, inner margin with a rare row of pectinate setae; segment 1 without setae. Maxilla 1, inner plate with two plumose apical setae; outer plate with 9 slender pectinate setae (spine-like setae); palp extending beyond outer plate, apex subtruncate, with a row of 5 stout setae (Watling, 1989: type IIA 3) and with a subapical row of 8 thin setae. Maxilla 2, inner plate slightly shorter and broader than outer plate; inner margin with two strong plumose setae. Maxilliped, inner plate very short, not reaching the basal article of palp, apex semicircular, with 3 button setae (Watling, 1989: type IIA 5) and with two slender setae at the outer part; outer plate short, reaching about 0.15 x length of palp segment 2, apex narrowly subtruncate; palp narrow, segment 2 0.87 times as long as segment 3, segment 3 with few strong plumose setae in the distal part of inner margin; dactylus slender, 1.5 times shorter than palp segment 3, the distal process of palp segment 3 is not conspicuous. Coxal plates 1 – 3 posteroventrally multi-cuspate, lower margins with central ventral rounded angle; coxal plate 4 much broader, deeply excavated posteroproximally, with rounded angle below; coxal plates 5 – 6 broadly posterolobate, posteriorly roundly subquadrate, coxal plate 7 semicircular. Coxal gills relatively small, sac-like. Pereopods 1 and 2 (gnathopods 1 and 2) small, weakly subchelate, subsimilar. Pereopod 1 linear, basis with rare anterior setae, carpus long, about 0.85 times as long as propodus, posterior lobe broad, shallow, with two specific plumose setae distally; propodus narrow, palm oblique, with small mid-palmar tooth, palmar angle with one transverse cluster of 4 or 5 spine-like setae; posterior margin with 3 groups of setae and with two single spine-like setae. Pereopod 2, basis long, linear, merus with posterodistal tooth, carpus long, about 0.65 times as long as propodus, carpal lobe as in pereopod 1, with 3 specific plumose setae distally, palmar margin oblique, with medial tooth and with 2 clusters of strong posterodistal spineformes setae, posterior margin with 4 or 5 transverse clusters of setae. Pereopods 3 and 4 destructed; basis linear, with short setae along anterior and posterior margins; merus anterodistally produced, acute, with 6 or 7 stout spineformes setae along posterior margin. Pereopods 5 – 7 destructed, closely homopodous in form and size; bases with posterior rounded wing, serrated posteriorly; merus posterodistally produced, acute, anterior margin with 6 groups of strong spine-like setae, posterior margin with 4 groups of cuspidate setae. Epimeral plates 1 – 3, lower margin with short spine-like setae; posteroventral corners with process, the largest in plate 2; posterior margins minutely serrated in plates 2 and 3. Pleopods regular, coupling basis of inner ramus with 4 (pleopods 1 and 2) or 5 (pleopod 3) specific stout two-pointed plumose setae. Uropod 1, peduncle slightly shorter than inner ramus; outer ramus the shorter; margins of peduncle and rami with serially arranged short spine-like setae. Uropod 2, inner ramus 1.6 times as long as peduncle, outer ramus the shorter, 0.72 times as long as inner. Uropod 3, inner ramus 3 times as long as peduncle, with a row of 7 small spineshaped setae along lateral and medial margins each, with acute and non-setae apex; outer ramus about 0.5 times as long as inner; outer ramus with a row of 7 small spine-shaped setae along lateral and medial margins each, with acute and non-setae apex. Telson linguiform, apically acute, length about 2.16 x width, with proximal ventral keel, without lateral paired short setae. Female: similar to male.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	materials_examined	Type material. Holotype, male, 11.1 mm, Х 53868 / Cr- 2413, Sea of Okhotsk, Far East of Russia (52 ° 28.9447 ’ N 143 ° 57.1337 ’ E, 72 m), sands, 11 August 2018. Paratype: 1 female, 7.6 mm, Х 53869 / Cr- 2414, with same data as holotype. Type locality. The north-east shelf of Sakhalin Island, Sea of Okhotsk, Far East of Russia (52 ° 28.9447 ’ N 143 ° 57.1337 ’ E, 72 m).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	etymology	Etymology. Named after the type locality near the Asian coast of Pacific Ocean. The name is masculine in gender.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	biology_ecology	Ecology: Neopleustes pulchellus asiaticus was found at the depth of 72 m on sands in the layer of constant low temperature (- 1.2 — + 0.5 ° C). Females with developed marsupium were found in August.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	distribution	Distribution: The shelf of north-eastern Sakhalin Island.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFE18615FF08FCB8FE22FF6C.taxon	discussion	Remarks. Neopleustes pulchellus asiaticus ssp. nov. is morphologically identical to the nominant subspecies Neopleustes pulchellus (Krøyer, 1846) (Hendrycks & Bousfield 2004; Krøyer 1846; G. Sars 1895). Neopleustes pulchellus asiaticus differs from N. pulchellus pulchellus by the presence of submedial and sublateral long pappose single setae dorsally on the head, pereonal and pleonal segments (Figs. 1 h, 1 i). In N. pulchellus asiaticus the lower margin of coxal plates 1 and 2 is with subquadrate central ventral angle; in N. pulchellus pulchellus the lower margin of coxal plates 1 and 2 is with acute central ventral angle (Figs. 4 h, i, 5 g, h).). Postero-ventral process of epimeral plate 2 is the largest in N. pulchellus asiaticus; in N. pulchellus pulchellus the postero-ventral process of epimeral plates 2 and 3 is subequal.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDD8614FF08FB41FB95FCC8.taxon	type_taxon	Type species. Sympleustes cornigera Shoemaker, 1964: 408, fig. 9. Species. Genus Shoemakeroides contains 2 species (Hendrycks & Bousfield 2004; http: // www. marinespecies. org): Shoemakeroides cornigerus (Shoemaker, 1964), Shoemakeroides gagarae (Gurjanova, 1972).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDD8614FF08FB41FB95FCC8.taxon	diagnosis	Diagnosis (from Hendrycks & Bousfield 2004 with additions). Body strong carinate on pereon segments 6, 7 and pleon. Urosome segment 2 occluded dorsally. Rostrum short, without anterodorsal crest. Antenna 1 much longer than antenna 2; peduncular segments 1 and 2 long, without distal process; segment 3 short; accessory flagellum very small, flat. Antenna 2, peduncular segments 4 and 5 subequal in length, with rare setae. Upper lip slightly notched apically and asymmetrical. Lower lip, outer lobes rounded, angles, widely separated by flat inner lobes. Mandibular molar small, stub-like, finely setulose, triturating surface lacking; left lacinia 8 – 10 - dentate, right lacinia lacking; incisors 7 - or 8 - dentate; raker setae 8 – 14, slender; palp strong, segment 3 with 11 – 14 E setae and with 4 medium length apical setae. Maxilla 1, inner plate with single seta or (rarely) without setae, palp with an apical row of 7 stout conical setae and fine surface setules; proximal segment with 1 or 2 marginal setae. Maxilla 2, inner plate with 1 or 2 subapical inner marginal setae and with rare apical setae. Maxilliped, inner plate broadened, with 4 – 6 button spineformes setae; outer plate short; palp large, segments subequal in length, segment 3 slightly produced distally, segment 4 slender, slightly cirved. Coxal plates 1 – 4 short, slightly increasing in depth and size from 1 to 4. Coxal plate 1 subquadrate with rounded anterodistal and posterodistal angles. Coxal plates 2 and 3 rounded distally. Hind corners of coxae 1 – 3 each with small cusp. Coxa 5 and 6 posterolobate. Pereopods 1 and 2 (gnathopods 1 and 2) powerful, dissimilar in form and size, not sexually dimorphic. Pereopod 1 (gnathopod 1), basis with numerose setae along distal half of anterior margin; carpus medium in length, with broad, shellow carpal lobe; propodus strong, palmar margin slightly oblique, with submedial tooth; dactylus slightly curved, as long as palmar margin. Pereopod 2 (gnathopod 2), basis with a row of rare short setae along anterior margin; merus with small postero-distal spine; carpus short, with narrow carpal lobe; propodus strong, inflated, palmar margin oblique, irregular, excavated behind submedial tooth; dactylus strong, slightly curved, as long as palmar margin. Pereopods 3 and 4 slender, medium long, carpus shorter than merus; dactylus medium in length. Pereopods 5 – 7, basis slightly broadened, long- rectangular, with rounded posterodistal angle, hind margin minutely serrate; carpus shorter than merus; dactylus medium in length. Pleon plates 1 – 3, hind corners produced, acuminate. Uropod 1, peduncle with distolateral spine, peduncle about as long as the inner ramus, outer ramus slightly shorter. Uropod 2, outer ramus distinctly shorter. Uropod 3 slender, outer ramus about 3 / 5 the length of inner ramus. Telson linguiform, longer than wide, keeled slightly proximally, without posterodistal notches, lateral margins with few short setae. Marsupial plates 2 relatively narrow, plates 3 or 4 broad, with medium setae; plate 5 narrow. Sexual dimorphism is shown in the structure of pereopods 2. In female the palmar margin of propodus with less pronounced excavation than in male.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDD8614FF08FB41FB95FCC8.taxon	distribution	Distribution. The north Pacific from Gulf of Alaska and Aleutian Islands to Sea of Okhotsk. All species of the genus are found in relatively deep locations in the depth range of 100 – 1800 m.	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDC8613FF08F8C9FD7FFEAF.taxon	description	Figures 1 j, 2 u, ac, 3 f, 4 j, 5 i, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDC8613FF08F8C9FD7FFEAF.taxon	distribution	Distribution: The eastern part of north Pacific from Gulf of Alaska to Aleutian Islands from a depth of 100 – 1800 m (Hendrycks & Bousfield 2004; Shoemaker 1964).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDB8613FF08FE4EFAF1FD07.taxon	description	Figures 1 k, 2 g, m, v, ad, 3 g, 4 k, 5 j, 22	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
AD4D87CDFFDB8613FF08FE4EFAF1FD07.taxon	distribution	Distribution: Sea of Okhotsk near the north-eastern Sakhalin Island from a depth of 515 m (Gurjanova 1972).	en	Labay, Vjacheslav S. (2021): Review of amphipods of the family Pleustidae Buchholz, 1874 (Crustacea Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). I. Subfamily Neopleustinae Bousfield & Hendrycks, 1994. Zootaxa 4974 (2): 267-306, DOI: https://doi.org/10.11646/zootaxa.4974.2.3
