Semicassis undulata

Semicassis undulata is a Mediterranean species of medium-sized sea snail, a marine gastropod mollusc in the subfamily Cassinae, the helmet snails and bonnet snails.

Semicassis undulata
Two live individuals in Archi, Reggio Calabria, Italy
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Cassidae
Genus:	Semicassis
Species:	S. undulata
Binomial name
Semicassis undulata (Gmelin, 1791)
Synonyms[1]
Phalium undulatum (Gmelin, 1791) Semicassis granulata undulata (Gmelin, 1791)

Taxonomy

This taxon was previously sometimes referred to at subspecies level as Semicassis granulata undulata, but in 2019, the World Register of Marine Species lists this Mediterranean taxon as a separate species from Semicassis granulata, which is a Western Atlantic taxon.^[1]

Distribution

This species occurs in the Mediterranean Sea and in the Atlantic Ocean off Northwest Africa and the Macaronesian Islands.