Monodonta australis

Monodonta australis, common name the toothed topshell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1]

Monodonta australis
Drawing with an apertural view of a shell of Monodonta australis
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Clade: Vetigastropoda
Order: Trochida
Superfamily: Trochoidea
Family: Trochidae
Genus: Monodonta
Species:
M. australis
Binomial name
Monodonta australis
(Lamarck, 1816)
Synonyms

Trochus australis Philippi

Description

The size of the shell varies between 12 mm and 35 mm. The shell is similar to Monodonta labio, but with rounder whorls, more marked sutures and with lower lirae. It is not granulose. It is tessellated with black and grayish or greenish. The penultimate whorl is subangulate by the prominence of its central rib. The columella is much less strongly dentate than in Monodonta labio, and the notch or canal below it shallow. The basal plicae are less developed than in Monodontia labio.[2]

Distribution

This marine species occurs off South Africa and in the Indian Ocean off Madagascar, Aldabra and the Mascarene Basin; also off Japan.

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References
  1. Monodonta australis (Lamarck, 1816). Retrieved through: World Register of Marine Species on 1 May 2010.
  2. Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia
  • Williams S.T., Donald K.M., Spencer H.G. & Nakano T. (2010) Molecular systematics of the marine gastropod families Trochidae and Calliostomatidae (Mollusca: Superfamily Trochoidea). Molecular Phylogenetics and Evolution 54:783–809.
  • "Monodonta australis". Gastropods.com. Retrieved 16 January 2019.
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