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Isidorella egregia (Preston, 1906)

Diagnostic features

The relatively high spire, very convex whorls and deep sutures, fine axial growth lines and rather elongated shape readily distinguish this species from I. newcombi. It reaches about 12 mm in length.

Incorrectly included in Glyptophysa by Smith (1992).


Isidorella egregia (Preston, 1906)

Class Gastropoda

Subclass Heterobranchia

Order Hygrophila

Superfamily Planorboidea

Family Planorbidae

Genus Isidorella Tate, 1896

Original name: Limnaea (Bulinus) egregia Preston, 1906. Preston, H. B. (1906). Description of a new species of Limnea from north western Australia Proceedings of the Malacological Society of London 7: 36.

Note: Physa contortula Clessin, 1886 (Type locality: Australia) may be an earlier name for this species.

Biology and ecology

Unknown, but probably similar to that of I. newcombi.


Indian Ocean division, Pilbara and Kimberley regions, Western Australia.


This genus is in need of revision, as the species concepts we have used have not been rigorously tested and can only be resolved by additional molecular and morphological studies involving dense sampling.

Further reading

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.

Walker, J. C. (1988). Classification of Australian buliniform planorbids (Mollusca: Pulmonata). Records of the Australian Museum 40: 61-89.