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Austropyrgus tateiformis Clark, Miller & Ponder 2003

Diagnostic features

This species belongs to the Austropyrgus rectus group, with members characterised by small to medium sized, narrow to broad shells, with spires of average length to very elongate, a straight outline and typically flattened to slightly convex whorls. The coiled oviduct has one or more bends, loops or twists.

Austropyrgus tateiformis differs from the other members of this group in the following combination of characters: shell narrow, with very elongate spire; ctenidium with short efferent branchial blood vessel joining pericardium; pallial vas deferens with overlying loops/coils at prostate; penis unpigmented.

This species is found in sympatry with A. conicus and A. smithii, from which it can be distinguished by its larger, taller (narrower) shell with straight-sided whorls.

Classification

Austropyrgus tateiformis Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus tateiformis 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 Blackwater Rivulet, at Blackwater Road, 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 only known from a single locality in northwestern Tasmania.

Notes

Most members of Austropyrgus, including this species, are geographically isolated and have restricted 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.