Cyphocottus eurystomus is a species of ray-finned fish belonging to the family Cottidae, the typical sculpins. It is endemic to Lake Baikal in Russia. It was described by Dmitrii Nikolaevich Taliev in 1955, originally as a subspecies of Asprocottus megalops.Taliev, D. N. 1955 [ref. 4316] Sculpin fishes of Lake Baikal (Cottidae). Acad. Sci. USSR, Moscow and Leningrad. 1–603. It is a freshwater fish endemic to Lake Baikal, Russia. It is known to dwell at a depth range of 50–600 metres.
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