Large Necklace Shell

Overview

The Large Necklace Shell is a predatory marine gastropod known for its distinctive, polished, and globose shell. It is a common inhabitant of sandy coastal environments, where it spends much of its time buried just beneath the surface in search of prey.

Appearance

This snail features a thin, glossy, brownish-yellow shell that can reach up to 3 cm in height. The shell is characterized by a large body whorl that makes up about 90% of its volume, a short spire with distinct sutures, and a large, rounded umbilicus. A single spiral row of reddish or brownish markings typically runs just below the suture of the last whorl. When active, the animal extends a large, cream-colored foot that partially covers the shell, and it possesses two flattened tentacles and a short snout.

Feeding

As a voracious carnivore, this species primarily hunts bivalves. It uses its powerful foot to capture and immobilize prey before drilling a neat, circular hole through the victim's shell. It then inserts its proboscis to inject digestive enzymes and consume the soft tissues inside.

Reproduction

This species is dioecious, meaning individuals are either male or female. During reproduction, females lay their eggs in a characteristic, collar-shaped mass made of sand grains and mucus, which resembles a necklace. These structures are often found on sandy substrates during the spring and early summer.