Labay Vjacheslav S
Sakhalin State University, Lenina St., 290, Yuzhno-Sakhalinsk, 693008, Russia Sakhalin Scientific Research Institute of Fisheries & Oceanography (SakhNIRO), Komsomolskaya St., 196, Yuzhno-Sakhalinsk, 693023, Russia..
Zootaxa. 2018 Nov 13;4521(2):220-230. doi: 10.11646/zootaxa.4521.2.4.
The new genus Cognateosymtes gen. nov. and new species C. serraticoxae sp. nov. are described from the shelf of western Sakhalin Island. The new genus has a set of features specific to the subfamily Eosymtinae: strongly ridged molar grinding surface of mandible and presence of a medial seta; inner plate of maxilla 1 with 2 strong apical plumose setae; inner plate of maxilla 2 with 2 strong submarginal setae, positioned subapically; pereopods 1 and 2 (gnathopods), propodal palmar margins lacking submedial tooth. Cognateosymtes differs from Eosymtes by the combination of character states: antenna 1, peduncular segment 1 with strong anterodistal processes; outer and inner plates of maxilla 2 with numerous apical setae; maxilliped, palp segment 2 linear, inner margin densely setose; coxae 1-3, posterodistal cusps multiple; dactylus of pereopods 3-7 the short. The key to the amphipod genera of the subfamily Eosymtinae Bousfield Hendrycks, 1994 is given.
新属同源合节虾属（Cognateosymtes gen. nov.）及新种锯齿状同源合节虾（C. serraticoxae sp. nov.）是在萨哈林岛西部大陆架发现并描述的。该新属具有合节虾亚科（Eosymtinae）特有的一系列特征：下颌骨臼齿研磨面有明显的脊，且有一根中刚毛；第一小颚内板有两根强壮的顶端羽状刚毛；第二小颚内板有两根强壮的亚边缘刚毛，位于亚顶端；第一和第二步足（颚足），腕节掌缘没有亚中齿。同源合节虾与合节虾属（Eosymtes）的区别在于以下特征组合：第一触角，柄节第一段有强壮的前远端突起；第二小颚的外板和内板有许多顶端刚毛；颚足，触须节第二段呈线性，内缘密被刚毛；第一至第三基节，后远端尖齿多个；第三至第七步足指节短。文中给出了1994年Bousfield和Hendrycks所描述的合节虾亚科（Eosymtinae）的端足类属的检索表。
