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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. One Tree Sinkhole. Photograph P. Wolf. Distribution of Posticobia sp. Posticobia species (adult length 2.2-2.6 mm) Class Gastropoda I nfraclass Caenogastropoda Order Littorinida Suborder Rissoidina Superfamily Truncatelloidea Family Tateidae Genus Posticobia redale, 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: 1ĕ109. Locality: One Tree Sinkhole, near Mt Gambier, South Australia. Biology and ecology Known only from empty shells in a 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: 1ĕ109. Clark, S. A. (2009). The genus Posticobia (Mollusca: Caenogastropoda: Rissooidea: Hydrobiidae SL) from Australia and Norfolk sland. Malacologia 51: 319-341. To cite this resource: Ponder, W. F., Hallan, A., Shea, M. and Clark, S. A., Richards, K., Klungzinger, M., and Kessner, V. 2020. Australian Freshwater Molluscs. https://keys.lucidcentral.org/keys/v3/freshwater_molluscs/ To contact the authors for comment or suggestions, please email: [email protected] Copyright © 2020. All rights reserved. The Australian Museum. .

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Posticobia Brazieri (E
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