King Helmet Snail

(Linnaeus, 1758)

Cassis tuberosa

Class:

Order:

Family:

Gastropoda

Littorinimorpha

Cassidae

Cassidae

Shell Information

Length (mm): 76-301

Dextral

Chirality:

The king helmet has about 6 shell whorls with a very large body whorl. The body whorl has a spiral rows of knobs and a fine grid of spiral and axial ribs. The aperture is long and narrow and the lip that forms on adults has a triangular shape. Both sides of the inner aperture have a series of folds with a dark brown color between them. The outer shell is often yellowish white to tan with irregular axial zigzags of brown color.

Description:

Ecological Information

Distribution:

Depth (m):

North Carolina to Brazil

0 to 27 meters

Diet:

Carnivore; They eat a variety of sea urchins.

Habitat:

Marine; Soft substrate and among seagrass

Misc. Facts

Citations

MolluscaBase eds. (2021). MolluscaBase. Cassis tuberosa (Linnaeus, 1758). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=224977 on 2021-06-23

Rosenberg, G., F. Moretzsohn, and E. F. Garc�a. 29. Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579�699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico�Origins, Waters, and Biota. Biodiversity. Texas A&M University Press, College Station, Texas.

Morris, P. A. (1987). A field guide to shells: Atlantic and Gulf coasts and the West Indies (3rd ed.). Houghton Mifflin.