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''Georissa'' is a genus of minute snails, terrestrial gastropod mollusks in the family Hydrocenidae. Although the species are best known for living on the surface of limestone rocks, they are often also found in and on the vegetation and on non-calcareous rocks. One species, ''Georissa filiasaulae'', is cavernicolous. It is only known from two caves in the Sepulut area of Sabah, Malaysian Borneo, where its above-ground sister species, ''Georissa saulae'', inhabits the rocks outside of the cave, and is connected to the cave snail via narrow zones of hybridization at the cave entrances. Possibly, ''G. filiasaulae'' has evolved without ever having been fully separated from its ancestor, a process known as speciation-with-gene-flow.〔Schilthuizen, M., E.J.M. Rutten & M. Haase, 2012. Small-scale genetic structuring in a tropical cave snail and admixture with its above-ground sister species. Biological Journal of the Linnean Society, 105: 727-740. doi:10.1111/j.1095-8312.2011.01835.x〕〔Schilthuizen, M., A.S. Cabanban & M. Haase, 2005. Possible speciation with gene-flow in tropical cave snails. Journal of Zoological Systematics, 43: 133-138. doi:10.1111/j.1439-0469.2004.00289.133–138〕 ==Species== Species within the genus ''Georissa'' include:〔Powell A. W. B., ''New Zealand Mollusca'', William Collins Publishers Ltd, Auckland, New Zealand 1979 ISBN 0-00-216906-1〕 * ''Georissa bangueyensis'' E.A. Smith, 1895 * ''Georissa biangulata'' * ''Georissa borneensis'' E.A. Smith, 1895 * ''Georissa elegans'' * ''Georissa everetti'' E.A. Smith, 1895 * ''Georissa filiasaulae'' Haase & Schilthuizen, 2007〔Haase M. & Schilthuizen M. (2007) "A new ''Georissa'' (Gastropoda: Neritopsina: Hydrocenidae) from a limestone cave in Malaysian Borneo". ''Journal of Molluscan Studies'' 73(3): 215-221. (abstract )〕 * ''Georissa gomantongensis'' E.A. Smith, 1894 * ''Georissa hadra'' Thompson & Dance, 1983 * ''Georissa hosei'' Godwin-Austen, 1889 * ''Georissa japonica'' Pilsbry, 1900〔Noseworthy R. G., Lim N.-R. & Choi K.-S. (2007). "A Catalogue of the Mollusks of Jeju Island, South Korea". ''Korean Journal of Malacology'' 23(1): 65-104. (PDF ).〕 * ''Georissa kobelti'' Gredler, 1902 * ''Georissa laevigata'' * ''Georissa laseroni'' * ''Georissa monterosatiana'' Godwin-Austen & Neville, 1879 * ''Georissa niahensis'' Godwin-Austen, 1889 * ''Georissa pachysoma'' Vermeulen & Junau, 2007 * ''Georissa purchasi'' * ''Georissa pyrrhoderma'' Thompson & Dance 1983 * ''Georissa pyxis'' (Benson) * ''Georissa rufula'' * ''Georissa saulae'' (van Benthem-Jutting, 1966) * ''Georissa scalinella'' (van Benthem-Jutting, 1966) * ''Georissa semisculpta'' * ''Georissa shikokuensis'' Amano, 1939 * ''Georissa similis'' E.A. Smith, 1894 * ''Georissa vesta'' Thompson & Dance, 1983 * ''Georissa williamsi'' Godwin-Austen, 1889 (including ''Georissa hungerfordi'') 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Georissa」の詳細全文を読む スポンサード リンク
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