Clanculus ringens

Lore & Background

The shell of Clanculus ringens varies between 8 mm and 13 mm. It is perforate, conical, and contains 7 whorls. The first whorl is smooth and yellowish; the following whorls are planulate, separated by canaliculate sutures, and maculate with chestnut and white. These whorls are spirally cingulate above with four elegantly granulate ridges, the upper and lower being larger. The body whorl is acutely carinated. The base of the shell is slightly convex, ornamented with 8 to 9 granose cinguli. The oblique aperture is rhomboidal and narrow, with a sulcate-denticulate basal margin. The columella is strong, oblique, and terminates below in a large tooth, ringent above; it is callous, ringent, and plicate.

Reader's Guide

Clanculus ringens is notable for its distinctive shell morphology, particularly the ringent (gaping) columella that gives the species its common name. The shell's ornamentation includes granulate ridges and granose cinguli, features that aid in identification within the genus Clanculus. The species is documented in multiple references spanning from the mid-19th to late 20th centuries, including works by Menke, Philippi, Fischer, Tate, Hedley, Cotton and Godfrey, Cotton, Wells and Bryce, Wilson, and Jansen. Its distribution is restricted to Australian waters, specifically off South Australia and Western Australia, making it an endemic component of the region's marine gastropod fauna. The species is listed in the World Register of Marine Species and has been illustrated in conchological literature, contributing to the taxonomic understanding of Trochidae.

Did You Know?

• The columella is described as ringent, meaning gaping or open above.
• The base of the shell is ornamented with 8 to 9 granose cinguli.
• This species is endemic to Australia, occurring off South Australia and Western Australia.