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
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| Kingdom:
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Animalia
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| Phylum:
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Mollusca
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| Class:
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Gastropoda
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| Subclass:
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Caenogastropoda
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| Order:
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Littorinimorpha
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| Superfamily:
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Tonnoidea
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| Family:
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Cassidae
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| Genus:
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Semicassis
Mörch, 1852
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| Type species
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Cassis japonica
Reeve, 1848
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| Synonyms
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- 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.