Classification of the genus Trigonia
G. †Trigonia Bruguière 1789
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Subg. †Trigonia (Clavitrigonia) Leanza 1942
Subg. †Trigonia (Heslingtonia) Fleming 1987
Subg. †Trigonia (Indotrigonia) Dietrich 1933
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†Trigonia (Indotrigonia) beyschlagi Müller 1900
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Invalid names: Trigonia crassa Kitchin 1900 [replaced]
†Trigonia (Indotrigonia) smeei Sowerby 1840
Subg. †Trigonia (Kumatrigonia)
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†Kumatrigonia tanourensis Tamura 1959
†Trigonia (Kumatrigonia) nemtinovi Bychkov 1985
†Trigonia (Kumatrigonia) qiaotouensis Lu 1981
Subg. †Trigonia (Pleurotrigonia) van Hoepen 1929
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†Trigonia (Pleurotrigonia) blanckenhorni Newton 1909
Subg. †Trigonia (Primatrigonia)
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†Trigonia (Primatrigonia) zlambachiensis Haas 1909
Invalid names: Trigonia (Modestella) Hautmann 2001 [objective synonym], Trigonia (Modesticoncha) Hautmann 2009 [objective synonym]
Subg. †Trigonia (Prosogyrotrigonia) Krumbeck 1924
Subg. †Trigonia (Trigonia) Bruguiere 1789
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†Trigonia (Trigonia) angustecostata Behrendsen 1892
†Trigonia (Trigonia) elegantoides Körner 1937
†Trigonia (Trigonia) gaytani Klipstein 1843
†Trigonia (Trigonia) heva Dollfus 1863
†Trigonia (Trigonia) signicollina Fleming 1987
†Trigonia (Trigonia) subcarinata Ebray 1863
†Trigonia aequicostata Gabb 1869
†Trigonia analoga Douvillé 1916
†Trigonia antiqua d'Orbigny 1842
†Trigonia azzarolae Stoppani 1865
†Trigonia bowersiana Anderson 1958
†Trigonia castani Henry 1876
†Trigonia castrovillensis Stephenson 1941
†Trigonia charlottensis Packard 1921
†Trigonia columbiana Packard 1921
†Trigonia coqueiroensis Maury 1936
†Trigonia cragini Stoyanow 1949
†Trigonia depauperata Douvillé 1916
†Trigonia devexa Eichwald 1871
†Trigonia doroschini Eichwald 1871
†Trigonia eufaulensis gabbi Stephenson 1941
†Trigonia eufaulensis moorei Stephenson 1941
†Trigonia gibboniana Lea 1840
†Trigonia guildi Stoyanow 1949
†Trigonia hemisphaerica Lycett 1877
†Trigonia imbricata Sowerby 1826
†Trigonia kayana Anderson 1938
†Trigonia kefersteini Münster 1828
†Trigonia kitchini Stoyanow 1949
†Trigonia maastrichtiana Briart 1888
†Trigonia maloneana Stoyanow 1949
†Trigonia marginata Damon 1860
†Trigonia mearnsi Stoyanow 1949
†Trigonia melhasei Anderson 1958
†Trigonia montanaensis Meek 1873
†Trigonia mooreana Gabb 1861
†Trigonia neuquensis Burckhardt 1903
†Trigonia nodulosa Lamarck 1801
†Trigonia obliqua Hyatt 1892
†Trigonia oregona Packard 1921
†Trigonia orientalis Douvillé 1916
†Trigonia oviedensis Lycett 1881
†Trigonia pandicosta Meek 1864
†Trigonia papuana Glaessner 1958
†Trigonia picteti Coquand 1865
†Trigonia plana Repin 2013
†Trigonia plumasensis Hyatt 1892
†Trigonia pseudocaudata Hector 1886
†Trigonia pseudocrenulata Notling 1884
†Trigonia pullus Sowerby 1826
†Trigonia rebouli Henry 1876
†Trigonia reesidei Stoyanow 1949
†Trigonia resoluta Stoyanow 1949
†Trigonia reticulata Agassiz 1841
†Trigonia saavedra Stoyanow 1949
†Trigonia somaliensis Stefanini 1939
†Trigonia stantoni Stephenson 1941
†Trigonia stolleyi Hill 1893
†Trigonia suborbicularis Forbes 1846
†Trigonia sulcata Hector 1874
†Trigonia tabacoensis Barthel 1958
†Trigonia taffi Cragin 1893
†Trigonia thierachensis Fischer 1969
†Trigonia undulatocostata Blanckenhorn 1890
†Trigonia weaveri Stoyanow 1949
†Trigonia whateleyae Buch 1844
†Trigonia windhauseniana Wilckens 1921