Cognateosymtes serraticoxae Labay, 2018

Labay, Vjacheslav S., 2022, Review of amphipods of the family Pleustidae Buchholz, 1874 (Amphipoda) from the coastal waters of Sakhalin Island (Far East of Russia). II. Subfamily Eosymtinae Bousfield & Hendrycks, 1994, Zootaxa 5125 (5), pp. 547-562 : 562

Cognateosymtes serraticoxae Labay, 2018

Figures 1c , 2c, f, i, l, o , 3f, g, h , 10

Cognateosymtes serraticoxae Labay, 2018: 223–228 , figs. 2–6.

Additional material. 1 females, Sea of Okhotsk , Far East of Russia (46º59,175´N, 143º06,416´E, 20 m), rock, V. S. Labay, 18 July 2019 .

Ecology. Cognateosymtes serraticoxae was found in the depth interval of 17–20 m on rock bottoms. Females with developed oostegites were detected in both localities in July.

Distribution: The shelf of Sakhalin Island, Sea of Japan ( Labay 2018). Recently (2019) discovered by the author in the Sea of Okhotsk on the shelf of south-eastern Sakhalin Island ( Fig. 11 ).

Remarks. The specimen of Cognateosymtes serraticoxae from shallow waters off southeastern Sakhalin Island are morphologically completely identical to specimens of the type series from coastal waters off southwestern Sakhalin Island ( Labay 2018).

Figures

FIGURE 1. Eosymtinae Bousfield & Hendrycks, 1994, lateral view: a—Eosymtes minutus Bousfield and Hendrycks, 1994 (from Bousfield and Hendrycks 1994: fig. 7), b—Eosymtes magnumoculis sp. nov., c—Cognateosymtes serraticoxae Labay, 2018 (from Labay 2018: fig. 2a)

FIGURE 2. Eosymtinae Bousfield & Hendrycks, 1994: a–c—peduncle of antenna 1; d–f—maxilla 2; g–i—palp of maxilliped; j–l—coxal plates 1–3 posteroventrally; m, n, o—propodus and dactylus of pereopods 3–7; a, d, g, j, m—Eosymtes minutus Bousfield and Hendrycks, 1994 (from Bousfield and Hendrycks 1994), b, e, h, k, n—Eosymtes magnumoculis sp. nov., c, f, i, l, o—Cognateosymtes serraticoxae Labay, 2018 (from Labay 2018)

FIGURE 3. Eosymtinae Bousfield & Hendrycks, 1994: a—urosome segments 1–3; c, f—uropod 1; d, g—uropod 2; b, e, h—uropod 3; a, b—Eosymtes minutus Bousfield and Hendrycks, 1994 (modified from Bousfield and Hendrycks 1994), c, d, e—Eosymtes magnumoculis sp. nov., f, g, h—Cognateosymtes serraticoxae Labay, 2018 (from Labay 2018)

FIGURE 10. Cognateosymtes serraticoxae Labay, 2018, coastal shallow waters off southeastern Sakhalin Island, female, 6.5 mm: a—incisor and molar of left mandible, b—incisor and raker setae of right mandible, c—maxilliped, d—maxilla 1, e—maxilla 2, f—gnathopod 1, g—gnathopod 2; scales: a, b, d, e—0.1 mm, c, f, g—0.5 mm

FIGURE 11. Distribution of Eosymtinae species in Far Eastern Region