Cassis madagascariensis

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Cassis madagascariensis
Cassis madagascariensis from Margarita Island.jpg
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Tonnoidea
Family: Cassidae
Subfamily: Cassinae
Genus: Cassis
Subgenus: Cassis
Species: C. madagascariensis
Binomial name
Cassis madagascariensis
Lamarck, 1822

Cassis madagascariensis is a species of very large sea snail, a marine gastropod mollusc in the family Cassidae, the helmet shells and bonnet shells.

Emperor/Queen Helmet Snail in the wild.


This species occurs in the tropical Western Atlantic.[citation needed] The specific name "madagascarensis" literally means "of Madagascar", but this was a misunderstanding of the type locality by the original author.[citation needed]


The maximum recorded shell length is 409 mm.[1]


United States Virgin Islands, St. John. Emperor/Queen Helmet Snails frequently observed (photographed) in depths as shallow as two feet. 2011 [2] This contradicts the previously reported minimum depth of 3 m.[1] The maximum recorded depth is 183 m.[1]

Human uses[edit]

Cameo by Ascione manufacture, 1925, Naples, Coral and Cameo Jewellery Museum.

Shells of Cassis madagascariensis are used in jewellery to make cameos.


  1. ^ a b c Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence". PLoS ONE 5(1): e8776. doi:10.1371/journal.pone.0008776.
  2. ^

External links[edit]