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Austropyrgus angasi (Smith, 1882)

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 angasi differs from the other species of this group with regards to the following characters: shell small to medium size, with squat spire and straight spire outline and convex whorls; penis with pigmentation absent or on all areas except base; coiled oviduct with proximal part inverted U-shaped.

Classification

Austropyrgus angasi (Smith, 1882)

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Hydrobia angasi Smith, 1882. Smith, E.A. (1882). On the freshwater shells of Australia. Journal of the Linnean Society of London, Zoology 16: 255–316.

Type locality: Campaspe (as Campasely) River, Victoria.

Synonyms: Hydrobia angasi Smith, 1882.

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 is a widespread species found in central Victoria.

Notes

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