Genus Gurjanovometopa gen. nov. Type species. Gurjanovometopa onenusica sp. nov. Species. Gurjanovometopa onenusica sp. nov. from the shelf of south-west Sakhalin Island (the Sea of Japan). Diagnosis. Body small, smooth above. Antenna 1 lacking nasiform process on article 1. Accessory flagellum absent. Palp of mandible 1-articulate; palp of maxilla 1 uniarticulate. Inner plate of maxilla 2 ordinary. Inner plates of maxilliped well separated; outer plate short, 1/10 times as palp article 1 length. Gnathopod 1 small, simple, merus and carpus with long narrow posterodistal lobe each; propodus elongated almond-shaped, without palmar margin. Gnathopod 2 enlarged, palm slightly oblique, with posterior tooth, carpus short, lobed. Pereopods 5–7 with rectolinear basis. Urosomite 1 ordinary, not highly elongate. Urosomites 1–3 free; pleonite 3 lacking dorsal process; urosomite 1 not weakly extended posterodorsally. Telson ordinary, linguiform, flat. Distribution. The coastal shallow waters of the Strait of Tartary (Sea of Japan) off southwestern Sakhalin Island (Fig. 1). Relationships. Gurjanovometopa gen. nov. differing from the other genera of Metopelloides group in the elongated almond-shaped propodus and by long posterodistal lobes of merus and carpus of gnathopod 1; and by the fully separated inner plates of maxilliped. Gurjanovometopa gen. nov. is similar to Pycnopyge Krapp-Schickel, 2000 in the structure of gnathopod 1 (Shoemaker 1955; Krapp-Schickel 2000), but differs from it in the structure of mandible (with palp) and subchelate gnathopod 2 (in Pycnopyge the gnathopod 2 is propodochelate). Differing from Aurometopa Barnard & Karaman, 1987, Goratelson J.L. Barnard, 1972, Knysmetopa Barnard & Karaman, 1987, Kyphometopa Krapp-Schickel, 2013, Ligulodactylus Krapp-Schickel, 2013, Malvinometopa Krapp-Schickel, 2011, Mesoproboloides Gurjanova, 1938, Mesometopa Gurjanova, 1938, Metopa Boeck, 1871, Metopoides Della Valle, 1893, Parametopa Chevreux, 1901, Proboloides Della Valle, 1893, Prometopa Schellenberg, 1926, Prostenothoe Gurjanova, 1938, Scaphodactylus Rauschert & Andres, 1993, Stenothoe Dana, 1852, Stenothoides Chevreux, 1900, Stenula J.L. Barnard, 1962, Synkope Krapp-Schickel, 1999, Torometopa Barnard & Karaman, 1987, Victometopa Krapp-Schickel, 2011, Wallametopa J.L. Barnard, 1974 in the narrower basis of pereopod 7; from Hardametopa Barnard & Karaman, 1991, Metopella Sars, 1892, Probolisca Gurjanova, 1938 in the reduction of the mandibular palp to 1 article, from Parametopella Gurjanova, 1938 and Sandrothoe Krapp-Schickel, 2006 by the presence of 1-articulate palp of mandible (Barnard & Karaman 1991; Bellan-Santini 2005; Gurjanova 1938; Krapp-Schickel 1999, 2006, 2011a, 2013; Rauschert & Andres 1993). Etymology. The genus Gurjanovometopa is named in the memory of the Russian carcinologist Evpraksia F. Gurjanova combined with the older genus name Metopa. The name is feminine in gender.

Published as part of Labay, Vjacheslav S., 2025, Gurjanovometopa onenusica gen. nov., sp. nov. (Crustacea: Amphipoda: Stenothoidae) from the Russian coasts of the Sea of Japan, pp. 407-419 in Zootaxa 5661 (3) on page 408, DOI: 10.11646/zootaxa.5661.3.7, http://zenodo.org/record/16605357