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Glacidorbis occidentalis Bunn & Stoddart, 1983

Diagnostic features

This minute (up to 1.2 mm in maximum diameter) species has a smooth shell with evenly convex whorls, and only has fine growth lines. It differs from all other species in the central radular teeth with a narrow base.

Classification

Glacidorbis occidentalis Bunn & Stoddart, 1983

Class Gastropoda

Subclass Heterobranchia

Superfamily Glacidorboidea

Family Glacidorbidae

Genus Glacidorbis Iredale, 1943

Original name: Glacidorbis occidentalis Bunn & Stoddart, 1983. Bunn, S.E. and Stoddart, J.A. (1983). A new species of the prosobranch gastropod Glacidorbis and its implications for the biogeography of South - Western Australia. Records of the Western Australian Museum 11: 49-57.

Type locality: Wugong Brook, Jarrahdale, at the Chandler Bridge, Western Australia.

Biology and ecology

In small intermittent streams, in gravel riffle sections. Locally common. Presumably feeds on small injured animals, such as insect larvae and other molluscs.

Additional information on the biology and ecology of this species can be found in Fauna of Australia, vol. 5B, p. 1075-1076, in Bunn and Stoddart (1983) and Ponder and Avern (2000).

Distribution

South-western Western Australia (ranges south of Perth).

Notes

The only Glacidorbis from Western Australia, found largely in intermittent streams.

Further reading

Bunn, S. E. & Stoddart, J. A. (1983). A new species of the prosobranch gastropod Glacidorbis and its implications for the biogeography of South Western Australia. Records of the Western Australian Museum 11: 49-57.

Bunn, S. E., Davies, P. M. & Edward, D. H. (1989). The association of Glacidorbis occidentalis Bunn and Stoddart, 1983 with intermittently–flowing, forest streams in south Western Australia. Journal of the Malacological Society of Australia 10: 25-34.

Meier-Brook, C. & Smith, B. J. (1976). Glacidorbis Iredale 1943, a genus of freshwater prosobranchs with a Tasmanian-Southeast Australian-South Andean distribution. Archiv Für Molluskenkunde 106: 191-198. 

Ponder, W. F. (1986b). Glacidorbidae (Glacidorbacea: Basommatophora), a new family and superfamily of operculate freshwater gastropods. Zoological Journal of the Linnean Society 87: 53-83.

Ponder, W. F. & Avern, G. J. (2000). The Glacidorbidae (Mollusca: Gastropoda: Heterobranchia) of Australia. Records of the Australian Museum 52: 307-353.