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Genus: Bositra Gregorio, 1886 † (DB: 15 SP)
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Bositra backlundi
Wittenburg, 1910 † (FOSSIL)
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Bositra borealis
Kurushin & Truschelev, 1989 † (FOSSIL)
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Bositra buchi
(F.A. Roemer, 1836 †) (FOSSIL)
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Posidonia ornati F.A. von Quenstedt, 1851 † =» Bositra buchi
(F.A. Roemer, 1836 †)
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Bositra circularis
Hsu, 1937 † (FOSSIL)
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Bositra inflata
Kurushin & Truschelev, 1989 † (FOSSIL)
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Bositra jakutica
Kurushin & Truschelev 1989 † (FOSSIL)
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Bositra limbata
H. Guo, 1985 † (FOSSIL)
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Bositra mimer
(Oberg 1877) † (FOSSIL)
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Bositra mimer
(Oeberg 1877 †) (FOSSIL)
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Bositra popowi
Bytschkov 1976 † (FOSSIL)
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Bositra sibirica
Kurushin, 1980 † (FOSSIL)
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Bositra sossunovi
Bytschkov & Efimova 1968 † (FOSSIL)
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Bositra taimyrensis
Kurushin, 1980 † (FOSSIL)
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Bositra tenuissima
Bohm, 1912 † (FOSSIL)
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Bositra tompoensis
Kurushin & Truschelev, 1989 † (FOSSIL)
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Genus: Posidonia Bronn, 1828 † (DB: 17 SP)
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Posidonia aranea
(Tozer, 1961 †) (FOSSIL)
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Claraia aranea Tozer, 1961 † =» Posidonia aranea
(Tozer, 1961 †)
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Posidonia becheri
H.G. Bronn, 1828 † (FOSSIL)
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Posidonia blatchleyi
W.M. Gabb, 1869 † (FOSSIL)
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Posidonia daytonensis
W.M. Gabb, 1864 † (FOSSIL)
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Posidonia dianensis
H. Guo, 1985 † (FOSSIL)
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Posidonia insignis
(J.W. Jackson, 1927 †) (FOSSIL)
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Posidonia jacksoni
Smith, 1927 † (FOSSIL)
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Posidonia kochi
(A. von Koenen, 1879 †) (FOSSIL)
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Posidonia madisonensis
Smith, 1927 † (FOSSIL)
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Posidonia membranacea
(F. McCoy, 1844 †) (FOSSIL)
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Posidonia olenekensis
A.M. Popov, 1964 † (FOSSIL)
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Posidonia kularensis Bychkov, 1976 † =» Posidonia olenekensis
A.M. Popov, 1964 †
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Posidonia plicata
(de Koninck, 1885 †) (FOSSIL)
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Posidonia semiundata
H. Guo, 1985 † (FOSSIL)
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Posidonia somaliensis
Cox, 1935 † (FOSSIL)
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Posidonia stella
(W.M. Gabb, 1864 †) (FOSSIL)
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Posidonomya stella W.M. Gabb, 1864 † =» Posidonia stella
(W.M. Gabb, 1864 †)
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Posidonia venusta
Münster, 1841 † (FOSSIL)
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Posidonia wengensis
Wissmann, 1841 † (FOSSIL)
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Sanguinolaria alpina Münster, 1841 † =» Posidonia wengensis
Wissmann, 1841 †
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Sanguinolaria okeni Münster, 1841 † =» Posidonia wengensis
Wissmann, 1841 †
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Genus: Posidonotis Losacco, 1940 † (DB: 1 SP)
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Posidonotis semiplicata
(A. Hyatt, 1894 †) (FOSSIL)
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Entolium balteatum Crickmay, 1928 † =» Posidonotis semiplicata
(A. Hyatt, 1894 †)
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Pectinula cancellata H.A. Leanza, 1943 † =» Posidonotis semiplicata
(A. Hyatt, 1894 †)
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Monotis symmetrica A. Hyatt, 1894 † =» Posidonotis semiplicata
(A. Hyatt, 1894 †)
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Genus: Pterohalobia Guo, 1985 † (DB: 1 SP)
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Pterohalobia productalata
H. Guo, 1985 † (FOSSIL)
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Genus: Indigirohalobia Polubotko, 1984 † (DB: 1 SP)
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Indigirohalobia pluriradiata
(Reed 1927) † (FOSSIL)
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