Ponticola bathybius

Neogobius bathybius is a species of goby endemic to the Caspian Sea, where it occurs in depths down to 200 m. It is strictly confined to the brackish-water basin and does not enter fresh waters. It can grow up to a length of 25 cm TL.

The species was transferred to the genus Ponticola from Neogobius on the basis of relationship revealed in molecular investigations. On the other hand, recent molecular studies have proven that this species belongs entirely to the genus Neogobius.