Posticobia norfolkensis (Sykes, 1900:146)

Norfolk (Island) posticobia (proposed)



Taxonomy & Nomenclature

Synonym/s: Paludestrina norfolkensis Sykes, 1900:146 (original description)


Conservation Status


Last record: 7 June 1913 (Ponder, 1981:17)

IUCN RedList status: Extinct



Norfolk Island, Australia (politically)


Biology & Ecology










Original scientific description:

Sykes, E. R. (1900). Notes on the non-marine Mollusca of Norfolk and Phillip Islands, with descriptions of new species. Proceedings of the Malacological Society of London 4(3): 139-147. [Extract]


Other references:

Baillie, J. and Groombridge, B. (eds). (1996). 1996 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

Braby, Michael F. (2019). Are insects and other invertebrates in decline in Australia? Austral Entomology 58(3): 471-477.

Clark, Stephanie A. (2009). The genus Posticobia (Mollusca: Caenogastropoda: Rissooidea: Hydrobiidae S.L.) from Australia and Norfolk Island. Malacologia 51(2): 319-341.

Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.

Groombridge, B. (ed.). 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

Mollusc Specialist Group. (1996a). Posticobia norfolkensis. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. ( Downloaded on 26 January 2012.

Mollusc Specialist Group. (1996b). Posticobia norfolkensis. The IUCN Red List of Threatened Species 1996: e.T18090A7654622. Downloaded on 26 June 2021.

Ponder, Winston F. (1981). Posticobia norfolkensis (Sykes), an apparently-extinct, fresh-water snail from Norfolk Island (Gastropoda: Hydrobiidae). Proceedings Of The Linnean Society Of New South Wales 105(1): 17-21.

Régnier, Claire, Fontaine, Benoît and Bouchet, Philippe. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions. Conservation Biology 23(5): 1214-1221.

Woinarski, John C. Z., Braby, M. F., Burbidge, A. A., Coates, D., Garnett, S. T., Fensham, R. J., Legge, S. M., McKenzie, N. L., Silcock, J L. and Murphy, B. P. (2019). Reading the black book: The number, timing, distribution and causes of listed extinctions in Australia. Biological Conservation 239: 108261.


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