| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Semicassis bisulcata Schubert & Wagner, 1829 |
Globular helmet shell | Western Pacific | |
| Semicassis bulla Habe, 1961 |
Pacific Ocean | ||
| Semicassis cicatricosa (Gmelin, 1791) |
Western Atlantic | 6 | |
| Semicassis faurotis (Jousseaume, 1888) |
Faurot's bonnet | Western Indian Ocean | |
| Semicassis glabrata (Dunker, 1852) |
Western Central Pacific | ||
| Semicassis granulata (Born, 1778) |
Scotch bonnet | Western Atlantic and Mediterranean Sea | 12.1 |
| Semicassis labiata (Carcelles, 1953) |
Western Atlantic | ||
| Semicassis pyrum (Lamarck, 1822) |
Helmet shell | Southwest Pacific | |
| Semicassis royana (Iredale, 1914) |
Southwest Pacific | ||
| Semicassis saburon (Bruguière, 1792) |
Mediterranean Sea | ||
| Semicassis sophia (Brazier, 1872) |
Southwest Pacific | ||
| Semicassis undulata (Gmelin, 1791) |
Eastern Atlantic | ||
| Semicassis whitworthi (Abbott, 1968) |
Eastern Indian Ocean |