Caspiosoma caspium (Kessler 1877)

This species is distinguished from other European gobies by the following characters: body slightly laterally compressed, anterior part is neither significantly wider nor flatter than caudal peduncle; head length 25-30% SL; no scales, granules, tubercles on body, but with 2-3 wide dark bars; no cephalic lateral line canals; D1 V-VII, with posterior extremity of its membranes reaching origin of D2; ; D2 with 11-13.5 branched rays; caudal peduncle about 3 times longer than deep; eye diameter about 20% HL; interorbital distance smaller than eye diameter; ventral part of second bar narrower than its middle part (Ref. 59043).

Occurs in lower reaches of rivers, deltas and estuaries; over muddy sand with shells (Ref. 4696). Feeds on benthic invertebrates, rotifers and algae (Ref.59043).

Occurs in lower reaches of rivers, deltas and estuaries; over muddy sand with shells (Ref. 4696). Eggs are pear-shaped (Ref. 4696). Feeds on benthic invertebrates, rotifers and algae (Ref.59043).

Caspiosoma caspium is a species of Ponto-Caspian goby native to the deltas of rivers inflows to the north-western Black Sea: Dnieper up to Berislav, also in the Dnieper-Bug Estuary and Berezan Estuary, Danube, Dniester with the estuary, Cuciurgan Reservoir. Found in the delta of the Don River, Volga, central and northern parts of the Caspian Sea and rivers flowing into the Sea of Azov. It can be found at depths of from 2 to 8 metres (6.6 to 26.2 ft). This species can reach a length of 4.5 centimetres (1.8 in) TL. It is currently the only known member of its genus.