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Gyraulus (Gyraulus) atkinsoni (Johnston, 1879)

Diagnostic features

Strongly compressed keeled shell with small sunken upper whorls. Similar to G. isingi, but larger (maximum diameter about 5 mm). In both species, the keel is positioned slightly towards the "base" (if viewed with the aperture on the right).


Gyraulus (Gyraulus) atkinsoni (Johnston, 1879)

Class Gastropoda

Subclass Heterobranchia

Order Hygrophila

Superfamily Planorboidea

Family Planorbidae

Genus Gyraulus Charpentier, 1837

Original name: Planorbis atkinsoni Johnston, R.M. (1879). Johnston, R. M. (1879). Further notes on the fresh-water shells of Tasmania. Papers Proceedings of the Royal Society of Tasmania 1878: 19-29.

Type locality: South Esk River, Tasmania.

Biology and ecology

On submerged leaves in rivers and streams in northern Tasmania.

Brown (1998) described the anatomy of this species.

Boray (1982) named G. isingi (and G. gilberti, as an intermediate host for the stomach fluke Orthocoelium streptocoelium.

Additional information on the biology and ecology of members of this family can be found in Fauna of Australia, vol. 5B, p. 1072-1074.



Further reading

Brown, D. S. (1981). Observations on the Planorbidae from Australia and New Guinea. Journal of the Malacological Society of Australia 5: 67-80.

Brown, D. S. (1998). Freshwater snails of the genus Gyraulus (Gastropoda: Planorbidae) in Australia: the taxa of Tasmania. Molluscan Research 19: 105-154.

Brown, D. S. (2001). Freshwater snails of the genus Gyraulus (Planorbidae) in Australia: taxa of the mainland. Molluscan Research 21: 17-107.

Hubendick, B. (1955). Phylogeny of the Planorbidae. Transactions of the Zoological Society of London 28: 453-542.

Smith, B. J. (1992). Non-marine Mollusca. Pp. i-xii, 1-408 in W. W. K. Houston. Zoological Catalogue of Australia, 8. Canberra, Australian Government Publishing Service.

Smith, B. J. & Kershaw, R. C. (1981). Tasmanian Land and Freshwater Molluscs. Hobart, University of Tasmania.