Vinogradovopleustes, Labay, 2018

Labay, Vjacheslav S., 2018, Vinogradovopleustes punctatum, new genus, new species, a pleustid amphipod from the Okhotsk Sea (Crustacea: Amphipoda: Gammaridea: Pleustidae: Pleusymtinae), Zootaxa 4392 (1), pp. 159-168 : 160

Genus Vinogradovopleustes n. gen.

Figures 2–7 .

Type material: Holotype: X 47110 Cr 2210. Paratypes X 47111 Cr 2211, X 47112 Cr 2212, X 47113 Cr 2213.

Type locality: Okhotsk Sea , Far East of Russia (55°00'00''N 142°02'40''E, 130 m).

Type species. Vinogradovopleustes punctatum sp. nov.

Species. Vinogradovopleustes punctatum sp. nov. from the shelf of north-east Sakhalin Island (Okhotsk sea).

Diagnosis. Pereon, pleon, and urosome 1 carinate middorsally. Urosome segment 2 occluded dorsally. Head, rostrum strong. Antenna 1, peduncular segment 1 enlarged, with small anterodistal and posterodistal acute processes. Antenna 2, peduncular segment 2 with long sharp posterodistal process. Upper lip, apical lobes slightly asymmetric. Mandible, left lacinia 10–11 dentate, right lacinia lacking; molar strong, columnar; blades 5–6 on left, 9–10 on right. Maxilla 2, inner plate with subapical inner marginal seta. Coxae 1–3 each with few (3–5) posterodistal cusps; coxae 5–6 posterolobate; coxa 5 with lateral posteror protrusion (stopper). Pereopods 1 & 2 (gnathopods 1 & 2), pereopod 2 slightly the larger. Palmar margin of propodus smoothly oblique; carpus, posterior lobe medium, merus without distinct posterodistal tooth. Pereopods 5–7 unequal in form; pereopod 5 shortest; basis of pereopod 5 linear, without posterior lobe; basis of pereopod 6 with narrow posterior lobe; basis of pereopod 7 broadened. Pleon plates 1–3 acutely produced postero-ventrally. Telson medium long, distally rounded, without paired pennicilate setae.

Distribution. The shelf of northern Sakhalin, Okhotsk Sea.

Relationships: Vinogradovopleustes n. gen. is similar to the genus Rhinopleustes Hendrycks & Bousfield, 2004 by the presence of a dorsal carination. Vinogradovopleustes differs from Rhinopleustes by the following combination of character states: antenna 1, peduncular segment 1 without strong anterodistal processes; coxae 1–3, posterodistal cusps multiple; pereopod 5, base linear (see also key).

Etymology: The genus Vinogradovopleustes is named in the memory of the famous Russian carcinologist Michail Vinogradov, combined with the older genus name Pleustes . The name is masculine in gender.

Figures

FIGURE 2. Vinogradovopleustes punctatum sp. nov., holotype, male, 8.5 mm, a, b, c, e, f; paratype, male, d: a—lateral view, b—antenna 1, c—antenna 2, d—upper lip, e, f—left mandibule; scale: a, b, c, e—1 mm; d—0.1 mm.

FIGURE 3. Vinogradovopleustes punctatum sp. nov., holotype, male, 8.5 mm, a, d, e, f; paratype, male, 8.5 mm, b, c: a, bright mandible, c—lower lips, d—maxilla 1, e—maxilla 2, f—maxilliped; scale: a, f—1 mm; b, c, d, e—0.1 mm.

FIGURE 4. Vinogradovopleustes punctatum sp. nov., holotype, male, 8.5 mm, a, c, d; e; paratype, male, 8.5 mm, b: a, b—coxa 1; c—pereopod 1, d—coxa 2, e—pereopod 2; scale: b, c, e,—1 mm; a, d—0.1 mm.

FIGURE 5. Vinogradovopleustes punctatum sp. nov., holotype, male, 8.5 mm, a, b, c, d, h; paratype, male, 8.5 mm, e, f, g: apereopod 3, b—coxa 4, c—pereopod 4, d—pereopod 5, e—coxa 5, f, g—sculpture of surface, h—pereopod 6; scale: a, b, c, d, e, h—1 mm.

FIGURE 6. Vinogradovopleustes punctatum sp. nov., holotype, male, 8.5 mm, b, e, f, g, h, i; paratype, male, 8.5 mm, a, c, d: a—pereopod 6, b, d—pereopod 7, c—coxa 7, e, f, g—epimer 1–3, h—pleopod 2, i—coupling spines of pleopod 2; scale: a, b, d, e, f, g, h—1 mm; c—0.1 mm.

FIGURE 7. Vinogradovopleustes punctatum sp. nov., holotype, male, 8.5 mm: a, b, c—coupling setae of pleopods 1, 2 and 3, d—uropod 1, e—uropod 2, f—uropod 3, g—telson; scale: d, e, f—1 mm; g—0.1 mm.