The Caspian tadpole goby (Benthophilus macrocephalus) is a species of goby which is widespread in the basin of the Caspian Sea, specifically in the near-estuary zone of the rivers and in small bays. It is a common species in the Volga River delta near Astrakhan, occurred in the deltas of rivers Terek, Ural, Samur.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. During the warmer months, this species prefers to live at depths of from , moving in the colder months to depths of . It can reach a length of TL.
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