Modulus (gastropod)

Modulus is a genus of small sea snails, marine gastropod molluscs in the family Modulidae.

Species
Species within the genus Modulus include:
 * Modulus ambiguus Dautzenberg, 1910
 * Modulus bayeri Petuch, 2001
 * Modulus bermontianus Petuch, 1994
 * Modulus cerodes A. Adams, 1851
 * Modulus disculus (Philippi, 1846)
 * Modulus guernei Dautzenberg, 1900
 * Modulus hennequini Petuch, 2013
 * Modulus honkerorum Petuch, 2013
 * Modulus kaicherae Petuch, 1987
 * Modulus lindae Petuch, 1987
 * Modulus modulus ( Linnaeus, 1758) - the type species, known as the "button snail"
 * Modulus nodosus Macsotay & Campos, 2001
 * Modulus pacei Petuch, 1987
 * Modulus turbinoides (Locard, 1897)
 * Taxa inquirenda:
 * Modulus duplicatus A. Adams, 1851
 * Modulus morleti P. Fischer, 1882
 * Modulus obliquus A. Adams, 1851
 * Modulus obtusatus (Philippi, 1847)
 * Species brought into synonymy:
 * Modulus calusa Petuch, 1988 : synonym of Trochomodulus calusa (Petuch, 1988) (original combination)
 * Modulus canaliculatus Mörch, 1876 : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus candidus Petit de la Saussaye, 1853 : synonym of Indomodulus tectum (Gmelin, 1791)
 * Modulus carchedonius (Lamarck, 1822) : synonym of Trochomodulus carchedonius (Lamarck, 1822)
 * Modulus catenulatus (Philippi, 1849) : synonym of Trochomodulus catenulatus (Philippi, 1849)
 * Modulus cidaris Reeve, 1848 : synonym of Modulus tectum (Gmelin, 1791) : synonym of Indomodulus tectum (Gmelin, 1791)
 * Modulus convexior Mörch, 1876 : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus dorsuosus Gould, 1853 : synonym of Modulus disculus (Philippi, 1846)
 * Modulus floridanus Conrad, 1869 : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus krebsii Mörch, 1876 : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus lenticularis (Lamarck, 1822) : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus perlatus (Gmelin, 1791) : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus pisum Mörch, 1876 : synonym of Modulus modulus (Linnaeus, 1758)
 * Modulus tectum (Gmelin, 1791) : synonym of Indomodulus tectum (Gmelin, 1791)
 * Modulus trochiformis Souleyet, 1852 : synonym of Trochomodulus catenulatus (Philippi, 1849)