Nassarius pyrrhus
A small Australian nassa with a noduled, folded shell.
Nassarius pyrrhus, called the red-banded nassa, is a sea snail and marine gastropod mollusc belonging to the Nassariidae family, which includes the nassa mud snails and dog whelks. Its shell, which ranges from 14 mm to 22 mm in length, is ovate and conical. The spire is short and pointed, made up of seven or eight convex whorls. These whorls have small nodules at their upper parts and are covered with slightly wavy longitudinal folds. On the body whorl, these folds often fade partly near the edge of the outer lip, and at the base of this whorl, a few grooves cut across the folds, creating a granular texture. The aperture is whitish, somewhat rounded, and slightly narrower at the top. The thick outer lip has a faint raised ridge, and its inner side is marked with many fine grooves. This species is found only in Australia, along the coasts of New South Wales, South Australia, Tasmania, Victoria, and Western Australia.
Quick Facts
- Genus
- Nassarius
- Species
- pyrrhus
Facts from the source article.
Lore & Background
The shell of Nassarius pyrrhus is ovate and conical, with a short, pointed spire composed of seven or eight convex whorls. The upper part of each whorl bears nodules, and the entire external surface is ornamented with slightly undulated longitudinal folds. On the body whorl, these folds often partially disappear near the edge of the outer lip, and a few striae at the base intersect the folds crosswise, forming granulations. The whitish aperture is subrotund and slightly narrowed above. The thick outer lip is accompanied by a slightly prominent external varix, and its internal part is marked with numerous fine striae.
Reader's Guide
Nassarius pyrrhus is a representative of the nassa mud snails or dog whelks, a group of marine gastropods known for their sculptured shells and predatory or scavenging habits. The species was described in the 19th century by Carl Theodor Menke, with additional taxonomic context provided by Jean-Baptiste Lamarck and Arthur Adams. Its common name, red-banded nassa, refers to the color pattern that distinguishes it from related species. The shell's combination of nodules, longitudinal folds, and granulated base striae offers a clear morphological signature for identification. As an Australian endemic, it contributes to the regional marine biodiversity of southern and western coastal waters. The species has been cataloged in major works on Australian marine shells, including Barry Wilson's comprehensive survey, and its presence across multiple states indicates a relatively broad temperate distribution. Its place within the Nassariidae family links it to a globally widespread group of snails that play ecological roles in intertidal and shallow subtidal communities.
Did You Know?
- The shell length of Nassarius pyrrhus ranges from 14 mm to 22 mm.
- The spire is composed of seven or eight convex whorls.
- The internal part of the outer lip is marked with numerous fine striae.
- This species is endemic to Australia, found off New South Wales, South Australia, Tasmania, Victoria, and Western Australia.
More in Marine Snails: Ceriths, Nassas and Conchs, Part 2 1-24
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