# Semicassis

Semicassis is a genus of medium-sized predatory sea snails, marine gastropod molluscs in the subfamily Cassinae within the family Cassidae, the helmet snails and bonnet snails.

## Species

According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus Semicassis:
* Semicassis adcocki (Sowerby III, 1896)
* Semicassis angasi (Iredale, 1927)
* Semicassis bisulcata (Schubert & Wagner, 1829)
* Semicassis bondarevi Mühlhäusser & Parth, 1993
* Semicassis bulla Habe, 1961
* Semicassis canaliculata (Bruguière, 1792)
* Semicassis cancellata (Lamarck, 1803)
* Semicassis centiquadrata (Valenciennes, 1832)
* Semicassis craticulata (Euthyme, 1885)
* Semicassis decipiens (Kilburn, 1980)
* Semicassis dorae (Kreipl & Mühlhäusser, 1996)
* Semicassis dougthorni Dekkers, 2013
* Semicassis faurotis (Jousseaume, 1888)
* Semicassis fernandesi (Kilburn, 1975)
* † Semicassis fibrata (P. Marshall & Murdoch, 1920)
* Semicassis glabrata (Dunker, 1852)
* Semicassis granulata (Born, 1778) - synonym: Phalium granulatum (Born, 1778)
* † Semicassis grateloupi (Deshayes, 1853)
* Semicassis inornata (Pilsbry, 1895)
* † Semicassis kaawaensis (Bartrum & Powell, 1928)
* Semicassis labiata (Perry, 1811)
* † Semicassis laevigata (Defrance, 1817)
* †Semicassis lilliei (C. A. Fleming, 1943)
* † Semicassis marwicki (C. A. Fleming, 1943)
* Semicassis microstoma (Martens, 1903)
* † Semicassis neumayri (Hoernes, 1875)
* Semicassis paucirugis (Menke, 1843)
* Semicassis pyrum (Lamarck, 1822)
* Semicassis royana (Iredale, 1914)
* Semicassis saburon (Bruguière, 1792)
* Semicassis semigranosa (Lamarck, 1822)
* Semicassis sinuosa (Verco, 1904)
* † Semicassis skinneri (Marwick, 1928)
* Semicassis sophia (Brazier, 1872)
* † Semicassis subsulcosa (Hoernes & Auinger, 1884)
* † Semicassis szilviae Kovács & Vicián, 2018
* Semicassis thachi Kreipl, Alf & Eggeling, 2006
* Semicassis thomsoni (Brazier, 1875)
* Semicassis umbilicata (Pease, 1861)
* Semicassis undulata (Gmelin, 1791)
* Semicassis westralis Kreipl, 1997
* Semicassis whitworthi (Abbott, 1968)
* Semicassis zeylanica (Lamarck, 1822)

### Species brought into synonymy

* Semicassis cicatricosa (Gmelin, 1791): synonym of Semicassis granulata (Born, 1778)
* Semicassis diuturna Iredale, 1927: synonym of Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
* Semicassis japonica (Reeve, 1848): synonym of Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
* Semicassis miolaevigata Sacco, 1890: synonym of Semicassis saburon (Bruguière, 1792)
* Semicassis obscura Habe, 1961: synonym of Semicassis bulla Habe, 1961
* Semicassis pauciruge: synonym of Semicassis paucirugis (Menke, 1843)
* Semicassis persimilis Kira, 1955: synonym of Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
* Semicassis pila (Reeve, 1848): synonym of Semicassis bisulcata (Schubert & J. A. Wagner, 1829)
* Semicassis salmonea Beu, Bouchet & Tröndlé, 2012: synonym of Semicassis bulla Habe, 1961

## Extinct Species

Extinct species within this genus include:
* Semicassis aldrichi Dall 1890 †
* Semicassis angasi Iredale 1927 †
* Semicassis deneseplicata Martin 1916 †
* Semicassis harpaeformis Lamarck 1803 †
* Semicassis labiata Perry 1811 †
* Semicassis monilifera Sowerby 1846 †
* Semicassis oligocalantica Vredenburg 1925 †
* Semicassis ovulum Ortmann 1900 †
* Semicassis pyshtensis Addicott 1976 †
* Semicassis reclusa Guppy 1873 †
Fossils of species within this genus have been found all over the world in sediments from Eocene to Quaternary (age range: 37.2 to 0.0 million years ago).