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Posticobia sp. 

Diagnostic features

This 'species' has a keeled last whorl and the last half of the last whorl is disjunct.

Classification

Posticobia sp. 

Class Gastropoda

Subclass Caenogastropoda

Order Littorinimorpha

Superfamily Truncatelloidea

Family Tateidae

Genus Posticobia Iredale, 1943

Original name: ?Austropyrgus sp. 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.

Type locality: One Tree Sinkhole, near Mt Gambier, South Australia.

Biology and ecology

Known only from empty shells in the sinkhole.

Distribution

One Tree Sinkhole, near Mt Gambier, South Australia.

Notes

This species occurs together with Austropyrgus vastus in One Tree Sinkhole, near Mt Gambier. That species also has a disjunct last half whorl and it is possible that these forms represent ecophenotypes of surface species; in this case Posticobia brazieri.

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.

Clark, S. A. (2009). The genus Posticobia (Mollusca: Caenogastropoda: Rissooidea: Hydrobiidae SL) from Australia and Norfolk Island. Malacologia 51: 319-341.