New and non-alien: Echinogammarus mazestiensis sp. n. from the southwestern Caucasus (Amphipoda: Gammaridae)

A new Ponto-Caspian species of the genus Echinogammarus Stebbing, 1899 (Amphipoda: Gammaridae), E. mazestiensis sp. n., is described from the estuary of the Mazesta River, Sochi Area, southwestern ...