Semicassis pyrum

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.

Semicassis pyrum
Semicassis pyrum (top).JPG
A shell of Semicassis pyrum, lateral view
Scientific classification edit
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Caenogastropoda
Order: Littorinimorpha
Family: Cassidae
Genus: Semicassis
S. pyrum
Binomial name
Semicassis pyrum
A shell of Semicassis pyrum, ventral view showing the parietal callus


  • Powell A. W. B., William Collins Publishers Ltd, Auckland 1979 ISBN 0-00-216906-1
  • "Semicassis pyrum". Retrieved 16 January 2019.

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