Classification of the family Posidoniidae
Fm. †Posidoniidae Frech 1909
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G. †Bositra De Gregorio 1886
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†Bositra circularis Hsu 1937
†Bositra limbata Guo 1985
†Bositra sabinensis Monari 1994
†Bositra sibirica Kurushin 1980
†Bositra wengensis Wissmann 1841
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Invalid names: Sanguinolaria alpina Münster 1841 [synonym], Sanguinolaria okeni Münster 1841 [synonym]
Invalid names: Peribositria Kurushin and Truschelev 1989 [synonym]
G. †Caenodiotis Monari 1994
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†Caenodiotis janus Meneghini 1853
Invalid names: Diotis Simonelli 1884 [replaced]
G. †Didymotis Gerhardt 1897
G. †Guerichia Rzehak 1910
G. †Posidonia Bronn 1828
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†Posidonia affinis Gemmellaro 1882
†Posidonia becheri Bronn 1828
†Posidonia bittneri de Lorenzo 1896
†Posidonia blatchleyi Gabb 1870
†Posidonia christophori Popov 1948
†Posidonia daytonensis Gabb 1864
†Posidonia dianensis Guo 1985
†Posidonia ekiatapensis Bychkov et al. 1976
†Posidonia elegans Gemmellaro 1882
†Posidonia gemmellaroi de Lorenzo 1896
†Posidonia germari Beyrich 1857
†Posidonia gibbosa Gemmellaro 1882
†Posidonia girtyi Morningstar 1922
†Posidonia idriana Mojsisovics 1873
†Posidonia jacksoni Smith 1927
†Posidonia lineolata Gemmellaro 1882
†Posidonia madisonensis Smith 1927
†Posidonia minuta von Zieten 1833
†Posidonia multicostata Emmons 1856
†Posidonia nodosocostata Giebel 1857
†Posidonia obliqua von Hauer 1875
†Posidonia obsoletestriata Tommasi 1894
†Posidonia ovalis Kittl 1912
†Posidonia praealpina Kittl 1912
†Posidonia semiundata Guo 1985
†Posidonia somaliensis Cox 1935
†Posidonia stella Gabb 1864
†Posidonia subtilis Bytschkov and Efimova 1968
†Posidonia triangularis Emmons 1856
†Posidonia wengensis Giebel 1857
Invalid names: Posidonomya Bronn 1835 [objective synonym]
G. †Posidonotis Losacco 1942
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†Posidonotis dainelii Losacco 1942
†Posidonotis semiplicata Hyatt 1894
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Invalid names: Entolium balteatum Crickmay 1928 [synonym], Monotis symmetrica Hyatt 1894 [synonym], Pectinula cancellata Leanza 1943 [synonym]
Invalid names: Pectinula [synonym]
G. †Pseudodidymotis
G. †Steinmannia Fischer 1886
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†Steinmannia alikiensis Milova 1988
†Steinmannia bronni Voltz 1833
†Steinmannia viligaensis Milova 1988
Invalid names: Aulacomya Steinmann 1881 [replaced]