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Austropyrgus grampianensis (Gabriel, 1939)

Diagnostic features

This species belongs to the Austropyrgus cooma group, whose members are characterised by generally pupiform to conical, small to medium sized shells, where the last whorl and base are evenly convex. A. grampianensis differs from other members of the group in the following combination of characters: shell small, with convex spire outline and convex whorls; aperture slightly disjunct; seminal receptacle at anterior edge of bursa copulatrix and its duct long.

Classification

Austropyrgus grampianensis (Gabriel, 1939)

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Bythinella grampianensis Gabriel, 1939. Gabriel, C. J. (1939). The freshwater Mollusca of Victoria. Memoirs of the National Museum of Victoria 11: 100–139.

Type locality: Near Silverband Falls, Grampians, Victoria.

Biology and ecology

In streams on water weeds, hard substrate (rocks etc.) and crawling on litter and sediment. Can be locally abundant. Assumed to feed by scraping bacteria and microalgae. Lay solitary capsules containing a single egg. Direct development.

Additional information on the biology and ecology of members of this family can be found in Fauna of Australia, vol. 5B, p. 752-755.

Distribution

This species is currently known from two small creeks in The Grampians, western Victoria.

Notes

Most members of Austropyrgus, including this species, are geographically isolated and have restricted ranges.

Further reading

Clark, S. A., Miller, A. C. & Ponder, W. F. (2003). Revision of the snail genus Austropyrgus (Gastropoda: Hydrobiidae): a morphostatic radiation of freshwater gastropods in southeastern Australia. Records of the Australian Museum 28: 1–109.

Gabriel, C. J. (1939). The freshwater Mollusca of Victoria. Memoirs of the National Museum of Victoria 11: 100-139.

Smith, B. J. & Kershaw, R. C. (1979). Field guide to the non-marine Molluscs of South-eastern Australia. Canberra, A.N.U. Press.