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Austropyrgus salvus Clark, Miller & Ponder 2003

Diagnostic features

This species belongs to the Austropyrgus sparsus group, whose members are characterised by the following shell features: small to medium sized shells, conical, with convex to slightly convex whorls. Furthermore, in females, the coiled oviduct is of an inverted U-shape or with two or more bends, loops or twists.

Austropyrgus salvus differs from other members of the group in the following combination of characters: shell small, squat, spire outline straight, with convex whorls; pallial vas deferens slightly undulating at prostate gland; penis with no pigmentation to medial section only; bursa copulatrix ovoid in shape.

This species is found in sympatry with one other species of Austropyrgus (A. parvus) within its currently recognized range.It differs from A. parvus in its larger, broader shell with more rounded whorls.

Classification

Austropyrgus salvus Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus salvus 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: Franklin River, opposite island downstream of Kutikina Cave, southwestern 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 known from the lower parts of the Franklin River and the upper parts of the Gordon River, south-western Tasmania.

Notes

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