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Austropyrgus lochi Clark, Miller & Ponder 2003

Diagnostic features

This species belongs to the Austropyrgus petterdianus group, whose members are characterised by the following shell features: the shell aperture slightly disjunct, with last whorl and base evenly convex. The outer lip is without reflection, and the colour of shell is yellow-brown and translucent. A. lochi differs from other members of the group in the following combination of characters: shell small, with elongated spire, straight spire outline and flattened to slightly convex whorls; anterior end of ctenidium abutting pericardium; pallial vas deferens strongly undulating at prostate gland.

This species can be found in sympatry with six other species of Austropyrgus (A. juliae, A. ronkershawi, A. procerus, A. mersus, A. conicus and A. rectoides) throughout its currently recognized range, with up to three in any one location. Its shell can be distinguished by its tall, narrow spire and straight outline. It is often found with A. juliae, from which it differs in its slightly broader, more conical shell with more flattened whorls.

Classification

Austropyrgus lochi Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus lochi 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: Small tributary of Little Claytons Rivulet, off Thompson Road, south of Ulverstone, 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 found in small streams across the mid-western part of the north coast to the mid-north coast of Tasmania.

Notes

Although most species of Austropyrgus are geographically isolated and have restricted ranges, a few - such as A. lochi - have wider 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.