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Clanculus undatus facts for kids

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Clanculus undatus
Clanculus undatus 002.jpg
Apertural view of a shell of Clanculus undatus
Scientific classification
  • Clanculus (Macroclanculus) undatus (Lamarck, J.B.P.A. de, 1816)
  • Macroclanculus occiduus Cotton & Godfrey, 1934
  • Monodonta undata Lamarck
  • Trochus smithi Wood, 1828
  • Trochus undatus Lamarck, 1816 (original description)

Clanculus undatus, common name the wavy Australian monodont, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.


The size of the shell varies between 20 mm and 40 mm. It is one of the largest species of Clanculus. The large shell has a depressed conoid shape. It is excavated and false-umbilicate in the center beneath. It is cinereous or rose colored, radiately striped with brown or black. The stripes are sometimes broken into irregular maculations, especially on the base. The about 6 whorls are convex around the upper part, then flattened, obtusely angulate at the periphery. The base of the shell is flattened and concave toward the center. The sutures are subcanaliculate. The acute apex is eroded. The following whorls are finely granose in spiral series, of which there are 10 to 12 on each whorl. The body whorl is somewhat deflected anteriorly, bearing about 30 spiral granose ridges, very close and fine upon and below the periphery, coarser above and around the umbilicus, the interstices obliquely striate. The oblique aperture is tetragonal. The outer and basal lips are thickened and plicate within. The oblique columella is inserted nearly in the bottom of the broad umbilical excavation, its edge reflexed and bearing about 10 denticles, twisted near the insertion, terminating below in a simple tooth. The parietal tract is wrinkled. The umbilicus has a plicate border, and in the middle a strong, sometimes crenulate, spiral funicle.


This marine species is endemic to Australia and occurs off New South Wales, South Australia, Tasmania, Victoria and Western Australia.

  • Lamarck, J.B.P.A. de M. 1816. Liste des objets représentés dans les planches de cette livraison. pp. 1–16 in Lamarck, J.B.P.A. de M. Tableau encyclopédique et méthodique des trois règnes de la nature. Vers, coquilles, mollusques et polypiers. Paris : Agasse Part 23 pp. 1–16, pls. 391-488
  • Wood, W. 1828. Index Testaceologicus; or A Catalogue of Shells, British and Foreign, arranged according to the Linnean system. London : Taylor Supplement, 1-59, pls 1-8
  • Cotton, B.C. & Godfrey, F.K. 1934. South Australian Shells. Part 11. South Australian Naturalist 15(3): 77-92
  • Wilson, B. 1993. Australian Marine Shells. Prosobranch Gastropods. Kallaroo, Western Australia : Odyssey Publishing Vol. 1 408 pp
  • Jansen, P. 1995. A review of the genus Clanculus Montfort, 1810 (Gastropoda: Trochidae) in Australia, with description of a new subspecies and the introduction of a nomen novum. Vita Marina 43(1-2): 39-62
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