Omalogyra

Omalogyra is a genus of minute marine gastropod molluscs in the family Omalogyridae.

This genus includes the smallest gastropods, with adult sizes of 1 mm and even less.

Species
Species within the genus Omalogyra include:
 * Omalogyra ammonitoides (Powell, 1940)
 * Omalogyra antarctica Egorova, 1991
 * Omalogyra atomus (Philippi, 1841) - atom snail
 * Omalogyra burdwoodiana Strebel, 1908
 * Omalogyra densicostata (Jeffreys, 1884)
 * Omalogyra disculus Palazzi, 1988
 * Omalogyra fusca Suter, 1908(Jeffreys, 1884)
 * Omalogyra fuscopardalis Rolán, 1992
 * Omalogyra liliputia (Laseron, 1954)
 * Omalogyra simplex (Costa O.G., 1861)
 * Omalogyra taludana Castellanos, 1989
 * Omalogyra undosa Palazzi, 1988
 * Omalogyra zebrina Rolán, 1992
 * Species brought into synonymy:
 * Omalogyra (Ammonicera) Vayssière, 1893 : synonym of Ammonicera Vayssière, 1893
 * Omalogyra (Ammonicera) planorbis (Dall, 1927): synonym of Palazzia planorbis (Dall, 1927)
 * Omalogyra (Ammonicera) rota Forbes & Hanley, 1850 : synonym of Ammonicera rota ( Forbes & Hanley, 1850)
 * Omalogyra atomus (Philippi, 1841) sensu Arnaud, 1972: synonym of Omalogyra antarctica Egorova, 1991 (misapplication)
 * Omalogyra ausonia Palazzi, 1988 : synonym of Palazzia ausonia (Palazzi, 1988)
 * Omalogyra bicarinata Suter, 1908 : synonym of Zerotula bicarinata (Suter, 1908)
 * Omalogyra discula Palazzi, 1988 : synonym of Omalogyra disculus Palazzi, 1988
 * Omalogyra fischeriana Monterosato, 1869 : synonym of Ammonicera fischeriana (Monterosato, 1869)
 * Omalogyra nodicarinata Sleurs, 1983 : synonym of Ammonicera nodicarinata (Sleurs, 1985)
 * Omalogyra planorbis (Dall, 1927) : synonym of Palazzia planorbis (Dall, 1927)
 * Omalogyra pulcherrima Brazier in Henn & Brazier, 1894 : synonym of Liotella pulcherrima (Brazier in Henn & Brazier, 1894)
 * Omalogyra vangoethemi Sleurs, 1983 : synonym of Ammonicera vangoethemi (Sleurs, 1985)