Gurjanovometopa, Labay, 2025

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 View FIGURE 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.