Semicassis
Temporal range: |
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| A live individual of Semicassis undulata from Italy |
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| Five views of a shell of Semicassis bisulcata from the Philippines |
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| Scientific classification |
| Domain: |
Eukaryota |
| Kingdom: |
Animalia |
| Phylum: |
Mollusca |
| Class: |
Gastropoda |
| Subclass: |
Caenogastropoda |
| Order: |
Littorinimorpha |
| Superfamily: |
Tonnoidea |
| Family: |
Cassidae |
| Genus: |
Semicassis
Mörch, 1852 |
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| Type species |
Cassis japonica
Reeve, 1848 |
| Synonyms |
- Antephalium Iredale, 1927
- Cassidea (Semicassis) Mörch, 1852
- Cassis (Semicassis) Mörch, 1852 (original rank)
- Faurotis Jousseaume, 1888
- Maucassis C. A. Fleming, 1943 †
- Phalium (Kahua) Marwick, 1928 †
- Phalium (Semicassis) Mörch, 1852
- Phalium (Xenogalea) Iredale, 1927
- Semicassis (Antephalium) Iredale, 1927· accepted, alternate representation
- Semicassis (Kahua) Marwick, 1928 †· accepted, alternate representation
- Semicassis (Semicassis) Mörch, 1852· accepted, alternate representation
- Semicassis (Xenophalium) Iredale, 1927
- Tylocassis Woodring, 1928
- Xenogalea Iredale, 1927
- Xenophalium Iredale, 1927
- Xenophalium (Mauicassis) C. A. Fleming, 1943
- Xenophalium (Xenogalea) Iredale, 1927
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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.