Knipowitschia iljini is a species of goby Endemic to the Caspian Sea, where it inhabits the deep waters in the central part. This species can reach a length of 4.7cm (01.9inches) TL. The specific name honours the taxonomist of Gobiiformes Boris Sergeevich Iljin (1889-1958), who researched the gobies of the Black and Caspian seas.[1]