Teratobaikalia macrostoma is a species of a freshwater snail with an operculum, an aquatic gastropod mollusk in the family Baicaliidae.
Teratobaikalia macrostoma is the type species of the genus Teratobaikalia.
Distribution Teratobaikalia macrostoma lives in the northern and central parts of Lake Baikal, in depths from 2 to 100 m. The type locality is Maloe More in Baikal.
Description The shell has 4.5-5 whorls. The width of the shell is 7.5–9 mm. The height of the shell is 8.75-11.5 mm.
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