One King Helmet shell, measuring 4 to 5 inches. ****

One King Helmet shell, measuring 4 to 5 inches.

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Cassis tuberosa, the king helmet, is a large sea snail species with a solid, heavy shell, a marine gastropod mollusc in the family Cassidae.

(REF: Cassis tuberosa (Linnaeus, 1758))

The King Helmet species are found in the Western Atlantic Ocean in waters off North Carolina, Florida, Mexico, Honduras, Colombia, Costa Rica, Panama, Venezuela, Bermuda, Bahamas, Turks & Caicos, Cuba, Hispaniola, Puerto Rico, Virgin Islands, Leeward Islands, Windward Islands, Brazil, and in the Eastern Atlantic Ocean at the Cape Verde Islands.

These shells have been measured to in length up to 12 inches. The Cassis tuberosa is generally cream colored with dark brown spots. The dorsal surface has fine growth lines and minute spiral lines.

They have been found in minimum depths of 3 feet to maximum recorded depths of 89 feet. The King Helmets live in shallow coastal waters around sandy beaches & and in reef environments. They dwell in tandem with seagrass beds, macroalgae banks, rhodolith beds and coral rubble.

(REF: Cassis tuberosa (Linnaeus, 1758)) (REF: Welch J. J. (2010). "The "Island Rule" and Deep-Sea Gastropods: Re-Examining the Evidence")

Scientific classification

Domain: Eukaryota

Kingdom: Animalia

Phylum: Mollusca

Class: Gastropoda

Subclass: Caenogastropoda

Order: Littorinimorpha

Family: Cassidae

Genus: Cassis

Species: C. tuberosa

Binomial name: Cassis tuberosa

(Linnaeus, 1758)