Somatogyrus

Somatogyrus is a genus of very small freshwater and brackish water snails that have an operculum, aquatic gastropod micromolluscs in the family Lithoglyphidae.

Species
Species within the genus Somatogyrus include:
 * Reverse pebblesnail, Somatogyrus alcoviensis Krieger, 1972
 * Somatogyrus aldrichi B. Walker, 1906 (W)
 * Ouachita pebblesnail, Somatogyrus amnicoloides B. Walker, 1915
 * Golden pebblesnail, Somatogyrus aureus Tryon, 1865
 * Angular pebblesnail, Somatogyrus biangulatus B. Walker, 1906
 * Knotty pebblesnail, Somatogyrus constrictus B. Walker, 1904
 * Coosa pebblesnail, Somatogyrus coosaensis B. Walker, 1904
 * Thick-lipped pebblesnail, Somatogyrus crassilabris B. Walker, 1915
 * Stocky pebblesnail, Somatogyrus crassus B. Walker, 1904
 * Tennessee pebblesnail, Somatogyrus currierianus (I. Lea, 1863)
 * Hidden pebblesnail, Somatogyrus decipiens B. Walker, 1909
 * Sandbar pebblesnail, Somatogyrus depressus (Tryon, 1862)
 * Ovate pebblesnail, Somatogyrus excavatus B. Walker, 1906
 * Cherokee pebblesnail,	Somatogyrus georgianus B. Walker, 1904
 * Fluted pebblesnail, Somatogyrus hendersoni B. Walker, 1909
 * Granite pebblesnail, Somatogyrus hinkleyi B. Walker, 1904
 * Atlas pebblesnail, Somatogyrus humerosus B. Walker, 1906
 * Ohio pebblesnail, Somatogyrus integra (Say, 1829)
 * Dwarf pebblesnail, Somatogyrus nanus B. Walker, 1904
 * Moon pebblesnail, Somatogyrus obtusus B. Walker, 1904
 * Sparrow pebblesnail, Somatogyrus parvulus Tryon, 1865
 * Shale pebblesnail, Somatogyrus pennsylvanicus B. Walker, 1904
 * Tallapoosa pebblesnail, Somatogyrus pilsbryanus B. Walker, 1904
 * Compact pebblesnail, Somatogyrus pumilus (Conrad, 1834)
 * Pygmy pebblesnail, Somatogyrus pygmaeus B. Walker, 1909
 * Quadrate pebblesnail, Somatogyrus quadratus B. Walker, 1906
 * Flint pebblesnail, Somatogyrus rheophilas F. G. Thompson, 1984
 * Elk pebblesnail, Somatogyrus rosewateri M. E. Gordon, 1986
 * Mud pebblesnail, Somatogyrus sargenti Pilsbry, 1895
 * Rolling pebblesnail, Somatogyrus strengi Pilsbury & B. Walker, 1906
 * Choctaw pebblesnail, Somatogyrus substriatus B. Walker, 1906
 * Savannah pebblesnail, Somatogyrus tenax F. G. Thompson, 1969
 * Opaque pebblesnail, Somatogyrus tennesseensis B. Walker, 1906
 * Somatogyrus trothis W. Doherty, 1878
 * Coldwater pebblesnail, Somatogyrus tryoni Pilsbry & F. C. Baker, 1927
 * Panhandle pebblesnail, Somatogyrus virginicus B. Walker, 1904
 * Gulf Coast pebblesnail, Somatogyrus walkerianus Aldrich, 1905
 * Channeled pebblesnail, Somatogyrus wheeleri B. Walker, 1915


 * Species brought into synonymy:
 * Somatogyrus clenchi, synonym of Aroapyrgus clenchi
 * Somatogyrus mexicanus, synonym of Aroapyrgus mexicanus
 * Somatogyrus subglobosus, synonym of Birgella subglobosa
 * Somatogyrus umbilicatus, synonym of Clappia umbilicata

NB: WoRMS considers one more species than ITIS. It is marked (W) in the list above.