Megastraea turbanica

Megastraea turbanica, common name the turban star shell, is a species of sea snail, a marine gastropod mollusk in the family Turbinidae, the turban snails.[1]

Megastraea turbanica
Shell of Megastraea turbanica (Dall, 1910)
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Turbinidae
Genus: Megastraea
Species:
M. turbanica
Binomial name
Megastraea turbanica
(Dall, 1910)
Synonyms[1]
  • Astraea petrothauma Berry, 1940
  • Astraea (Uvanilla) rupicollina Stohler, 1959
  • Pomaulax turbanicus Dall, 1910 (basionym)

Description

The size of the shell attains 150 mm. The shell is moderately large and rather thin. It is brilliantly pearly inside. It is covered with a reddish-brown periostracum which becomes olivaceous on the base. The form is rather depressed with turgid whorls, about six in all. The nucleus is white, blunt, imperfect. The base of the shell is flattened, bordered by a sparsely nodulous carina. The sculpture on the spire is slightly protractive, rounded, and short. It contains rather elevated riblets reaching about half way forward on the whorl from the suture (17 on the last whorl). These end in or are barely separated from the same number of stout nodules at the periphery, with a marked sulcus separating them from a similar row of nodules on the margin of the base. The base contains four somewhat undulated spiral ridges separated by subequal interspaces, except the inner pair which are smaller and closer to each other. The base is imperforate and is swollen at the base of the columella. The aperture is ample. The surface of the bodyis erased, leaving visible a pearly and white substance. The pearly columella is arcuate with no anterior prominence or tooth. The outer lip and the base is simple and sharp. The white operculum is rounded, shelly, with three partly gyrate, very prominent, granose, narrow ribs. The spaces between them are excavated and smooth.[2]

Distribution

This species occurs in the Pacific Ocean off California, USA.

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References
  1. Megastraea turbanica (Dall, 1910). Retrieved through: World Register of Marine Species on 5 October 2010.
  2. W.H. Dall (1910) New Species of West American Shells; The Nautilus v. 23, 1910 (described as Pomaulax turbanicus)
  • Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.
  • Alf A. & Kreipl K. (2011) The family Turbinidae. Subfamilies Turbininae Rafinesque, 1815 and Prisogasterinae Hickman & McLean, 1990. In: G.T. Poppe & K. Groh (eds), A Conchological Iconography. Hackenheim: Conchbooks. pp. 1–82, pls 104-245.
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