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Austropyrgus buchanensis 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.

A. buchanensis differs from other members of the group in the following combination of characters: shell small to medium in size, with convex whorls; osphradium near posterior end of ctenidium; rectum with short S-shape; pericardium about ½ in pallial roof; prostate gland about 1/3–1/2 in pallial roof; pallial vas deferens straight at prostate; penis pigmented on medial section only; coiled oviduct and bursal duct join at posterior pallial wall.

Classification

Austropyrgus buchanensis Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus buchanensis 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: Fairy Creek, first crossing after kiosk, Buchan Caves, Victoria.

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 and rivers of eastern Victoria and southern New South Wales.

Notes

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

This species is not found together 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.