Mesogobius nigronotatus

Mesogobius nigronotatus is a species of gobiid fish native to the Caspian Sea. It is only known from a couple of samples, from Kazakhstan and the southern part of the sea; the type material has been lost. It is suspected to be the same taxon as that known as Mesogobius nonultimus.

It has been found at a depth of 43 m. The length of the fish was 6 cm TL.