This 'species' has a keeled last whorl and the last half of the last whorl is disjunct.
Posticobia sp.
Class Gastropoda
Infraclass Caenogastropoda
Order Littorinida
Suborder Rissoidina
Superfamily Truncatelloidea
Family Tateidae
Genus Posticobia Iredale, 1943
Original name: ?Austropyrgus sp. In 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.
Locality: One Tree Sinkhole, near Mt Gambier, South Australia.
Known only from empty shells in a sinkhole.
One Tree Sinkhole, near Mt Gambier, South Australia.
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.
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.
