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Austropyrgus tebus 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 tebus differs from other members of the group in the following combination of characters: shell small to medium in size, with straight to weakly convex spire outline and convex whorls; pallial vas deferens slightly undulating at prostate gland; proximal part of coiled oviduct with two or more bends, loops or twists; seminal receptacle at middle of inner wall of bursa copulatrix.

Classification

Austropyrgus tebus Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus tebus 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 Pipers River, on western slopes of Eagle Hawk Tier, Mt Arthur, 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 around the Lilydale area of northern Tasmania.

Notes

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

This species is not found in sympatry with any other species of Austropyrgus.

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.