Ogasawarana metamorpha (Kuroda, 1956)



Taxonomy & Nomenclature

Synonym/s: Pleuropoma metamorpha Kuroda, 1956 (protonym); Ogasawarana nitida Minato, 1980 (junior homonym and synonym)


Conservation Status

Rediscovered in July 2010

IUCN RedList status: Critically Endangered


This species is considered extinct by (Cowie et al., 2017), who may not have been aware of its rediscovery.



Ogasawara Islands, Japan


Biology & Ecology










Original scientific description:

Kuroda, T. (1956). Nihon oyobi rinsetsu chi’iki-san rikusei kairui so (2) [Synopsis of the terrestrial mollusks of Japan and adjacent areas part 2]. Venus 19(2): 132-147. [In Japanese.]


Other references:

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

Callomon, Paul. (2015). On the authorship and types of three Ogasawara helicinids (Mollusca: Gastropoda). Proceedings of the Academy of Natural Sciences of Philadelphia 164(1): 21-29.

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.

Iwakawa, T. (1919). Catalogue of the Japanese Mollusca in the Natural History Department, Tokyo Imperial Museum. 2+3+318+595+39 pp. Tokyo, Imperial Museum.

Minato, Hiroshi. (1980). Helicinidae of the Ogasawara Islands, with the Descriptions of Five New Species. Venus (Japanese Journal of Malacology) 38(4): 235-246.

Mollusc Specialist Group. (1996). Ogasawarana metamorpha. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. ( Downloaded on 20 April 2014.

MolluscaBase eds. (2021). MolluscaBase. Ogasawarana metamorpha (Kuroda, 1956). Accessed at: on 2022-04-23

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


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