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Temporal range: Eocene - Recent
Semicassis undulata.jpg
A live individual of Semicassis undulata from Italy
Semicassis bisulcata booleyi 01.JPG
Five views of a shell of Semicassis bisulcata from the Philippines
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Tonnoidea
Family: Cassidae
Subfamily: Cassinae
Genus: Semicassis
Mörch, 1852 [1]
Type species
Cassis japonica Reeve, 1848

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. [2]


According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus Semicassis:

Species brought into synonymy
  • Semicassis pauciruge: synonym of Semicassis paucirugis (Menke, 1843)
  • Semicassis undulata (Gmelin, 1791): synonym of Semicassis granulata undulata (Gmelin, 1791)
Fossil shell of Semicassis rondoletii

Extinct Species[edit]

Extinct species within this genus include: [3]

  • 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).


  1. ^ Mörch, O.A.L. (1852) Catalogus Conchyliorum quae Reliquit D’Alphonso d’Aguirra & Gadea Comes de Yoldi, Regis Daniae Cubiculariorum Princeps, Ordinis Dannebrogici in Prima Classe & Ordinis Caroli Terth Eques. Vol. 1. L. Klein, Hafniae, 74 pp.
  2. ^ WoRMS : Semicassis; accessed: 17 June 2012
  3. ^ Fossilworks