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''Exogyra'' is an extinct genus of fossil saltwater oysters, marine bivalve mollusks in the family Gryphaeidae, the foam oysters or honeycomb oysters.〔http://crnmac1.physics.uiowa.edu/fossils/oysters/ilymatogyra/Exogyra-plexa.html Evolution of ''Exogyra plexa''〕 These bivalves grew cemented by the more cupped left valve. The right valve is flatter, and the beak is curved to one side. ''Exogyra'' lived on solid substrates in warm seas. The subgenus Aetostreon is sometimes considered a separate genus, due to a lack of the fine set of parallel ribs (chomata) separated by pits, on the inner surface of the valves (which is present in the nominate subgenus).〔 ==Species== ''Exogyra'' (subgenus ''Exogyra'') (Say, 1820) *''Exogyra africana'' Say, 1820 〔http://zipcodezoo.com/Animals/E/Exogyra_africana/〕 *''Exogyra aquillana'' Stephenson, 1953 *''Exogyra arietina''〔http://www.bivatol.org/downloads/Lab_2_Bivalve_Fossil_Record_curriculum.pdf〕〔https://www.wardsci.com/store/catalog/product.jsp?catalog_number=528130〕 *''Exogyra callophyla'' Ihering, 1903 *''Exogyra cancellata'' Stephenson, 1914 *''Exogyra clarki'' Shattuck, 1903 *''Exogyra columbella'' Meek, 1876 *''Exogyra contorta'' Eichwald, 1868 *''Exogyra costata'' *''Exogyra davidsoni''〔http://fossilworks.org/bridge.pl?a=taxonInfo&taxon_no=304725〕 *''Exogyra columba'' *''Exogyra erraticostata'' Stephenson 〔http://fossilsofnj.com/invertebrates/exogyra.htm〕 *''Exogyra fimbriata'' Conrad, 1855 *''Exogyra flabellata'' *''Exogyra ganhamoroba'' Maury, 1936 *''Exogyra guadalupae'' Whitney, 1937 (thesis) *''Exogyra haliotoidea'' Maury, 1936 *''Exogyra laevigata''〔Lake.P., and Rastall.R.H., (1913), ''A Text Book of Geology'', 2nd edition, London: Edward Arnold's Geological series Page 426 and 436〕 *''Exogyra laeviuscula'' Roemer, 1849 *''Exogyra lancha'' Stoyanow, 1949 *''Exogyra levis'' Stephenson, 1952 *''Exogyra mutatoria'' White, 1887 *''Exogyra obliquata'' Pulteney〔Castell. C.P., and Cox. L.R., (1975), ''British Mesozoic Fossils'', 5th edition, London: Trustees of the British Museum (Natural History), page 86〕 *''Exogyra paupercula'' Cragin, 1893 *''Exogyra plexa'' Cragin, 1893 *''Exogyra potosina'' Castillo and Aguilera, 1895 *''Exogyra ponderosa'' Roemer, 1852 *''Exogyra praevirgula'' Douville & Jourdy, 1924 〔http://translate.google.co.uk/translate?hl=en&sl=fr&u=http://science.mnhn.fr/all/list%3FspecificEpithet%3Dpraevirgula%26genus%3DExogyra&prev=search〕〔http://gni.globalnames.org/name_indices/98855151/name_index_records〕 *''Exogyra quitmanensis'' Cragin, 1893 *''Exogyra sergipensis'' Maury, 1936 *''Exogyra sigmoidea'' 〔Ivanov. M., Hrdlickova. S., and Gregorova. R., (2005), The Complete Encyclopedia of Fossils, 3rd. ed., Lisse: Rebo International, page 133〕 Reuss, 1844 *''Exogyra solea'' Muller, 1910 *''Exogyra upatoiensis'' Stephenson, 1914 *''Exogyra whitneyi'' Bose, 1910 *''Exogyra woolmani'' Richards, 1947 ''Exogyra'' (subgenus ''Aetostreon'') (Bayle, 1878)〔Paleobiology Database, (n.d.), ''Exogyra (Aetostreon)'', (), (''Exogyra (Aetostreon)'' entry ), accessed 7 May 2013〕 *''Exogyra aquila'' Brongniart, 1871 *''Exogyra bale'' *''Exogyra couloni'' Say, 1820 *''Exogyra imbricatum'' Kraus, 1843 〔Pewgaczewska.H., (n.d.) http://www.app.pan.pl/archive/published/app20/app20-047.pdf〕 (possibly a morphotype of ''E. couloni'') *''Exogyra latissimum'' 〔Anon, (n.d.), Aetostreon latissium As a Derived Fossil, (), Available at: http://www.fcaq-geolotech.co.uk/shop/bivalves/96-aetostreon-latissimum-as-a-dreived-fossil.html, Accessed 7 May 2013〕 *''Exogyra miotaurinensis'' Sacco, 1897 〔Paleobiology Database, (n.d.), Exogyra (Aetostreon miotaurinensis, (), Available at: http://paleodb.org/?a=basicTaxonInfo&taxon_no=118252, accessed 7 May 2013〕 (Type species of subgenus) *''Exogyra neocomiensis''〔 * ''Exogyra pilmatuegrossum'' *''Exogyra rectangularis''〔Global Names Index, (2000), Global Names Index, (), Available at: http://gni.globalnames.org/name_strings?page=213&search_term=ns%3AAET%2A, Accessed 7 May 2013〕 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「Exogyra」の詳細全文を読む スポンサード リンク
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