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Austropyrgus mersus Clark, Miller & Ponder 2003

Diagnostic features

This species can be found in sympatry with up to three species of Austropyrgus (A. conicus, A. rectoides and A. lochi) throughout its range. It can be distinguished from the other Tasmanian species by its small size and broad, squat shell that has a convex outline. The only similar Tasmanian species is A. conicus, which is larger.

Classification

Austropyrgus mersus Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus mersus 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: Dip Falls, Dip River, Arthur River area, above falls, Tasmania.

Biology and ecology

This species is found on weeds, leaves, roots and stones and can be locally common.

Distribution

Austropyrgus mersus occurs in a few small streams and rivers mainly around the Dip Falls area of northwest Tasmania.

Notes

Most species of Austropyrgus are geographically isolated and have restricted ranges, and this one has a rather small range.

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.