Print Fact Sheet

Austropyrgus juliae 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. julieae differs from other members of the group in the following combination of characters: shell narrow, with very elongated spire and straight to weakly-convex spire outline and flattened to slightly convex whorls. Pallial vas deferens straight at prostate gland; only medial section of penis pigmented; coiled oviduct with initial bends orientated dorsoventrally.

This species can be found in sympatry with three other species of Austropyrgus (A. lochi, A. conicus and A. procerus) throughout its currently recognized range and from which it can be distinguished by its narrow, elongate spire and rounded whorls.

Classification

Austropyrgus juliae Clark, Miller & Ponder 2003 

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus juliae 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 West Gawler River, 3 km east of Preston, 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 known from a number of small streams of central northern Tasmania.

Notes

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