Lyogyrus

Lyogyrus is a genus of very small freshwater snails with a gill and an operculum, aquatic gastropod mollusks in the family Amnicolidae.

== Species == Species within the genus Lyogyrus include: Lyogyrus bakerianus (Pilsbry, 1917) Lyogyrus brownii (H. F. Carpenter, 1872) Lyogyrus granum (Say, 1822) Lyogyrus latus F. G. Thompson & Hershler, 1991 Lyogyrus pilsbryi (B. Walker, 1906) Lyogyrus pupoideus (A. Gould, 1840) Lyogyrus retromargo (F. G. Thompson, 1968) Lyogyrus walkeri (Pilsbry, 1898) Synonyms: † Lyogyrus beizhenensis Youluo, 1978 (unavailable name) Lyogyrus browni [sic]: synonym of Lyogyrus brownii (H. F. Carpenter, 1872) (incorrect spelling of original species name) † Lyogyrus cylindricus Youluo, 1978 (unavailable name) Lyogyrus dalli Pilsbry & Beecher, 1892: synonym of Amnicola dalli (Pilsbry & Beecher, 1892) (original combination) Lyogyrus greggi (Hershler, date unknown) - Rocky Mountain duskysnail: synonym of Colligyrus greggi (Pilsbry, 1935) Lyogyrus limosus (Say, 1817): synonym of Amnicola limosus (Say, 1817) Lyogyrus vanhyningi Vanatta, 1934: synonym of Floridobia vanhyningi (Vanatta, 1934) (original combination)