Nassarius pullus

Lore & Background

The shell of Nassarius pullus is ovate and ventricose, with a pointed spire of six or seven whorls. These whorls are slightly angular at their upper part and loaded with very convex longitudinal folds near the suture; the folds become less prominent and more flattened upon the outer lip of the body whorl. Numerous transverse striae intersect the shell, and the upper extremity of the fold is sometimes separated by a stria that divides them superficially. The white aperture is ovate, terminated above by an emargination of the outer lip and by a transverse ridge of the inner lip. The outer lip is thin, slightly denticulated at the base, and furnished with numerous striae internally. The columella is arcuated, covered by the inner lip, which conceals part of the body of the shell by its expansion and forms a large, white, and polished callosity. The ground color is whitish, ash, or bluish, sometimes without spots or bands, at other times with two or three deeper bands that surround the whorls.

Reader's Guide

Nassarius pullus is a species within the Nassariidae family, a group of marine gastropods known as nassa mud snails or dog whelks. Its distribution spans the Central and East Indian Ocean, including waters off Mauritius, Madagascar, Tanzania, East India, Sri Lanka, Thailand, the Philippines, and China, as well as the Western Pacific Ocean off Papua New Guinea, New Caledonia, the New Hebrides, the Solomon Islands, and Queensland, Australia. The species has been referenced in works by Bruguière (1789), Adams (1852), Dautzenberg (1929), Satyamurti (1952), Spry (1961), and Wilson (1994), among others. Its shell morphology—with longitudinal folds, transverse striae, and a polished callosity—distinguishes it within the genus. The variability in banding and color, from whitish to bluish with or without bands, contributes to its identification. The species is part of the broader systematic study of Nassariidae, as treated by Cernohorsky (1984). Its presence across a wide geographic range from East Africa to the Western Pacific underscores its adaptability to diverse marine environments.

Did You Know?

• The shell length of Nassarius pullus varies between 10 mm and 25 mm.
• Its common names include black nassa, olive dog whelk, and ribbed dog whelk.
• The shell ground color is whitish, ash, or bluish, sometimes with two or three deeper bands.
• This species occurs in the Central and East Indian Ocean and the Western Pacific Ocean.