Litorogammarus mazestiensis (Marin & Palatov, 2021) comb. nov.

Fig. 18 a, b

Echinogammarus mazestiensis Marin & Palatov, 2021: 3, figs 1–3 [type locality—Mazesta, Sochi].

Material examined. 5 ÔÔ, 5♀♀, LEMMI — Northeastern Black Sea, Russian Federation, Krasnodar region, Sochi area, estuary of the Mazesta River, 43°32’35.3”N, 39°47’28.5”E, under stones and among river pebbles, hand net sampling, Marin I.N. & Palatov D.M. leg., 16.05.2019 .

Diagnosis. Head with oblique anteroventral lobe (see Marin & Palatov, 2021: Supplementary Figure S5 b). Pleon with urosomite I bearing a pair of long median setae; urosomite II with 1 marginal long spine on each side and a pair of median short spines; urosomite III with 1 long marginal spine of each side (see Marin & Palatov, 2021: Figure 3 g). Antenna I smooth, non-setose, with 6-segmented accessory flagellum (see Marin & Palatov, 2021: Figure 2 b). Antenna II slightly shorter that AI, with long ventral setae, without calceoli both in males and females. Pereopods V–VII: basis (article 2) with straight dorsal margin and feebly marked ventral lobes (see Marin & Palatov, 2021: Supplementary Figure S3). Epimeral plates with sharp and produced posteroventral angles.

GenBank accession number. OP466441, OP466428 (this study).

Habitats and distribution. The species is presently known only from its type locality, the mouth (estuary) of the Mazesta River, Sochi area, SW Caucasus, Russia (see Marin & Palatov, 2021), living under pebble and stones, where it forms significant aggregations .