Semicassis pyrum

Semicassis pyrum
A shell of Semicassis pyrum, lateral view
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Tonnoidea
Family: Cassidae
Subfamily: Phaliinae
Genus: Semicassis
Species: S. pyrum
Binomial name
Semicassis pyrum
(Lamarck,1822)

Semicassis pyrum, common name the "pear bonnet" or "common helmet", is a species of large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells, bonnet shells and their allies.

A shell of Semicassis pyrum, ventral view showing the parietal callus

References