Semicassis pyrum

Semicassis pyrum
A shell of Semicassis pyrum, lateral view
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Littorinimorpha
Family:	Cassidae
Genus:	Semicassis
Species:	S. pyrum
Binomial name
Semicassis pyrum (Lamarck,1822)
Synonyms [1]
† Cassidea multisectaH. J. Finlay, 1924 Cassidea stadialisHedley, 1914 Cassis niveaBrazier, 1872 Cassis pirum Cassis pyrumLamarck, 1822 † Cassis striatusF. W. Hutton, 1873 Cassis tumidaPetterd, 1886 Phalium pyrum(Lamarck, 1822) Phalium stadiale(Hedley, 1914) Semicassis (Semicassis) pyrum(Lamarck, 1822) Semicassis pyrum f. hamiltoni(A. W. B. Powell, 1928) Semicassis pyrum pyrum(Lamarck, 1822) Xenogalea dendaCotton, 1945 Xenogalea finlayiIredale, 1927 Xenogalea halliCotton, 1954 Xenogalea mawsoniCotton, 1945 Xenogalea powelliH. J. Finlay, 1928 Xenogalea pyrum(Lamarck, 1822) Xenogalea spectabilisIredale, 1929 Xenogalea stadialis(Hedley, 1914) Xenogalea wilsoniCotton, 1954 Xenophalium (Xenogalea) abernethyiDell, 1956 Xenophalium (Xenogalea) mataiA. W. B. Powell, 1952 Xenophalium abernethyiDell, 1956 Xenophalium finlayi(Iredale, 1927) Xenophalium hamiltoniA. W. B. Powell, 1928 Xenophalium harrisonaeA. W. B. Powell, 1928 Xenophalium mataiA. W. B. Powell, 1952 [2] Xenophalium pyrum(Lamarck, 1822) Xenophalium pyrum pyrum(Lamarck, 1822) Xenophalium wanganuienseA. W. B. Powell, 1928

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

1. "Semicassis pyrum (Lamarck, 1822)". WoRMS. World Register of Marine Species . Retrieved 28 October 2025.
2. Powell, A. W. B. (1952). "New Zealand Molluscan Systematics, with Descriptions of New Species, Part 1". Records of the Auckland Institute and Museum . 4: 169–185. ISSN   0067-0464. JSTOR   42906061. Wikidata   Q58676734.

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

Media related to Semicassis pyrum at Wikimedia Commons