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Austropyrgus latus 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 latus differs from the other members of this group in the following combination of characters: shell broad, with straight spire outline and flattened whorls; pallial vas deferens strongly undulating at base of penis; penis unpigmented; female genital opening of medium length and overlapping anterior end of capsule gland.

Classification

Austropyrgus latus Clark, Miller & Ponder 2003

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Austropyrgus Cotton, 1942

Original name: Austropyrgus latus 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: Surrey River at Princes Highway, south of Heywood, 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 widespread throughout the streams and rivers of southeastern South Australia and western Victoria.

Notes

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