Clanculus limbatus
A keeled marine snail endemic to southern Australian waters.
Clanculus limbatus, known as the keeled clanculus, is a marine gastropod mollusk in the family Trochidae. Its shell, which ranges from 13 to 20 mm, is depressed and umbilicate, with a conoidal shape and a distinct keel at the periphery. The shell is whitish or yellowish, marked with brown, often with a series of blotches at the periphery and beneath the suture; the space between may be plain or somewhat tessellated. The base is either tessellated or has radiating flame-like markings. The spire is low and conical, with a smooth, acute apex. The five to six whorls are convex just below the sutures, then flatten, and are keeled at the periphery; the sutures are slightly channeled. The body whorl barely descends forward, bearing six to eight spiral, closely granulose bands above and seven to nine similar concentric bands below. The gaps between these bands are closely, sharply, and obliquely striated on a microscopic scale. The base is slightly convex. The aperture is oblique and tetragonal, with the outer lip having four or five lirae inside, the upper one enlarged and tooth-like. The basal margin and the rib around the umbilicus are finely plicate. The columella is oblique and nearly straight, with a reflexed, plicate-dentate edge that ends in a small square tooth below and attaches above to the side of the umbilicus. The umbilicus is fairly wide and funnel-shaped. This species is endemic to Australia, found off South Australia, Tasmania, Victoria, and Western Australia.
Quick Facts
- Taxon
- Clanculus limbatus
Facts from the source article.
Lore & Background
The shell of Clanculus limbatus is depressed, umbilicate, and conoidal in shape, with a carinate periphery. Its color is whitish or yellowish, maculated with brown, often with a series of blotches at the periphery and beneath the suture; the intervening space may be unicolored or more or less tessellated. The base is tessellated or radiately flamed. The spire is low conical with an acute, smooth apex. The 5 to 6 whorls are convex just below the sutures, then flattened, and carinated at the periphery. The sutures are subcanaliculate. The body whorl scarcely descends anteriorly, above with 6 to 8 spiral closely granose cinguli, beneath with 7 to 9 similar concentric cinguli. The interstices both above and below are closely, sharply, obliquely, and microscopically striate. The base of the shell is slightly convex. The oblique aperture is tetragonal. The outer lip is four or five-lirate within, the upper fold somewhat enlarged and subdentiform. The basal margin and marginal rib of the umbilicus are finely plicate. The columella is oblique, nearly straight, its edge reflexed and plicate-dentate, terminating below in a small square denticle, inserted above upon the side of the umbilicus. The umbilicus is rather wide and funnel-shaped.
Reader's Guide
Clanculus limbatus is a well-documented species within the Trochidae family, with its description originating from the works of Philippi in 1849. The species has been cited in numerous malacological studies and regional surveys, including those by Adams (1853), Angas (1865), Tenison-Woods (1879), and more recent works by Cotton (1959), Macpherson & Gabriel (1962), and Jansen (1995). Its distribution is restricted to Australian waters, specifically off South Australia, Tasmania, Victoria, and Western Australia. The shell's detailed sculpture—including granose cinguli, microscopically striate interstices, and a plicate-dentate columella—has made it a subject of taxonomic interest. The species is listed in the World Register of Marine Species and has been featured in the online resource Gastropods.com. Its presence in multiple historical and modern references underscores its continued relevance in the study of Australian marine gastropods.
Did You Know?
- The shell size of Clanculus limbatus varies between 13 mm and 20 mm.
- The columella is oblique, nearly straight, with a reflexed and plicate-dentate edge terminating in a small square denticle.
- This marine species is endemic to Australia, occurring off South Australia, Tasmania, Victoria and Western Australia.
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