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Austropyrgus bullerensis Clark, Miller & Ponder 2003

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. bullerensis differs from other members of the group in the following combination of characters: shell with straight to weakly-convex spire outline and slightly convex whorls; rectum of short S-shape; distal and medial penis pigmented; oviduct bent just before bursal duct joins and coiled oviduct and bursal duct join just in front of posterior pallial wall.

Classification

Austropyrgus bullerensis Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha 

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus bullerensis Clark, Miller & Ponder 2003. Clark, S. A., Miller, A. C. and 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 Supplement 28: 1–109.

Type locality: Tributary of Delatite River, at Mt Buller Road, 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 a single small stream near the base of Mt Buller, eastern Victoria.

Notes

Most species of Austropyrgus are geographically isolated and have restricted ranges, but this one has a reasonable range. Although no other species of Austropyrgus are known from a radius of at least 80 km around the Mt Buller area of central Victoria. The species of closest geographical proximity are A. macedonensis from Mt. Macedon area, central Victoria, about 150 km to the west, and A. cooma from the Cooma area, southern New South Wales, about 250 km to the east.

The most similar species in Victoria are A. daylesfordensis, A. macedonensis, A. grampianensis, A. colensis and A. otwayensis.

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.