Planorbis leucostoma Millet, 1813 Anisus leucostoma is a European species of small air-breathing freshwater snail, an aquatic pulmonate gastropod in the family Planorbidae, the ram's horn snails and their allies.

Glöer (2002)[3] considered Anisus septemgyratus (Rossmässler, 1835) as a junior synonym of Anisus leucostoma (Millet, 1813).

Later Glöer & Meier-Brook (2008)[4] used name Anisus septemgyratus again.

[5] The shell of this species is about 8 mm in maximum dimension, usually planispiral and tightly coiled, with a white rib in the aperture.

[6] This species occurs in countries and islands including: This Planorbidae-related article is a stub.