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Austropyrgus elongatus (May, 1921)

Diagnostic features

Members of the Austropyrgus elongatus group are characterised by medium-sized shells with very elongate spires, a straight outline, and convex whorls.

Austropyrgus elongatus differs from the only other species of this group in the following combination of characters:shell medium in size, spire very elongated, more convex whorls; 4 pairs of basal cusps on central teeth; ctenidium with short efferent branchial blood vessel connecting it to pericardium.

This species is found in sympatry with A. colludens, from which its is distinguished by its more elongate spire.

Classification

Austropyrgus elongatus (May, 1921)

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original namePotamopyrgus elongatus May, 1921. May, W. L. (1921). A revised census of the Tasmanian fluviatile Mollusca. Papers and Proceedings of the Royal Society of Tasmania 1920: 65–75.

Type locality: Stream flowing into Long Bay, Tasman Peninsula, Tasmania.

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 only known from a single location on the Aspley River, south of Bicheno, eastern Tasmania.

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.