Supplanaxis

Supplanaxis is a genus of small sea snails, marine gastropod mollusks in the subfamily Planaxinae of the family Planaxidae.

Species
Species within the genus Supplanaxis include:
 * Supplanaxis acutus (Krauss, 1848)
 * † Supplanaxis beaumonti (Bayan, 1870)
 * Supplanaxis leyteensis Poppe, Tagaro & Stahlschmidt, 2015
 * Supplanaxis nancyae (Petuch, 2013)
 * Supplanaxis niger (Quoy & Gaimard, 1833)
 * Supplanaxis nucleus (Bruguière, 1789)
 * Supplanaxis obsoletus (Menke, 1851)
 * Supplanaxis planicostatus (G. B. Sowerby I, 1825)
 * Species brought into synonymy:
 * Supplanaxis abbreviatus (Pease, 1865) : synonym of Supplanaxis niger (Quoy & Gaimard, 1833)
 * Supplanaxis acuta [sic] : synonym of Supplanaxis acutus (Krauss, 1848)