Benthophilus casachicus is a species of goby widespread along the eastern coasts of the Caspian Sea from the Cape Pischanyi to Ogurja Ada at south, also near Astrakhan.Boldyrev V.S., Bogutskaya N.G. (2007) Revision of the tadpole-gobie of the genus Benthophilus (Teleostei: Gobiidae). Ichthyol. Explor. Freshwaters, 18(1): 31-96. This species prefers estuaries and coastal waters. This species can reach a length of TL.
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