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Austropyrgus glenelgensis 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 glenelgensis differs from other members of the group in the following combination of characters: shell small to medium in size, with straight spire outline and slightly convex whorls; penis pigmented on medial section only; coiled oviduct with initial U orientated longitudinally backwards.

This rather variable species is sympatric with up to three species of Austropyrgus (A. latus, A. tumidus and A. exiguus) throughout its currently recognized range. Its shell is smaller and has more rounded whorls than that of A. latus and is larger and broader than that of A. exiguus.

Classification

Austropyrgus glenelgensis Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus glenelgensis 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: Spring at Post and Rail North Camp, Lower Glenelg National Park, 5.4 km east of Battersleys Camp, 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 flowing into the lower part of the Glenelg River, western Victoria and south-eastern South Australia.

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.