Clanculus granti

Lore & Background

The shell of Clanculus granti is solid, umbilicate, conical, and pointed at the apex, slightly angled on the shoulder, rounded at the periphery, and flattened on the base. It contains seven whorls. The colour on the last three whorls consists of oblique and zigzag brick-red stripes extending from suture to the periphery, with pale cream between these stripes and on the apex and base. The sculpture on the third, fourth, and fifth whorls features distinct spiral grooves latticed by oblique threads that do not cross the intervening ridges; this sculpture gradually fades on later whorls, leaving the body whorl smooth and polished. Around the axis on the base run four profound spiral grooves, the outer deepest, separated by smooth, prominent, narrow cords. The narrow umbilicus is bounded by a tuberculate rib, within which it is excavate and spirally ascends the full height of the shell's interior. The aperture is very oblique and rhomboidal. The outer lip is sharp, bevelled within, and carries a strong deep-seated tubercle. The parietal callus is coarsely wrinkled. The columella spirally ascends the umbilicus, terminating anteriorly in a massive bifid tooth and higher up supporting a small tubercle.

Reader's Guide

Clanculus granti is documented in the scientific literature through works such as Wilson's 1993 'Australian Marine Shells' and Jansen's 1995 review of the genus Clanculus in Australia. The species is recorded from the Philippines, Fiji, Tonga, and Queensland, Australia, indicating a distribution across the western Pacific and Coral Sea regions. Its shell characteristics, including the zigzag brick-red stripes and the transition from sculptured to smooth whorls, provide diagnostic features for identification within the Trochidae family. The species is listed in the World Register of Marine Species and on Gastropods.com, reflecting its recognition in malacological databases. The detailed description of the shell's umbilicus, aperture, and columella contributes to the taxonomic understanding of the genus Clanculus.

Did You Know?

• The shell height attains 10 mm and contains seven whorls.
• The last three whorls have oblique and zigzag brick-red stripes on a pale cream background.
• The body whorl is smooth and polished, while earlier whorls have spiral grooves latticed by oblique threads.
• The columella terminates anteriorly in a massive bifid tooth and supports a small tubercle higher up.