Classification of the genus Trigonarca
G. †Trigonarca Conrad 1862
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Subg. †Trigonarca (Costelliarca) Chiplonkar and Tapaswi 1973
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†Trigonarca (Costelliarca) gamana Forbes 1846
†Trigonarca (Costelliarca) punctulata Kendrick and Vartak 2007
†Trigonarca (Costelliarca) trichinopolitensis Forbes 1846
†Trigonarca acclivis Conrad 1852
†Trigonarca angolensis Rennie 1929
†Trigonarca californica Packard 1922
†Trigonarca camerunensis Riedel 1933
†Trigonarca cardiformis von Koenen 1897
†Trigonarca curvatodonta Riedel 1933
†Trigonarca excavata Packard 1922
†Trigonarca furoni Dartevelle and Freneix 1957
†Trigonarca jacksonensis Anderson 1958
†Trigonarca jessupae Maury 1930
†Trigonarca ligeriensis d'Orbigny 1844
†Trigonarca manzadinensis Dartevelle and Freneix 1957
†Trigonarca schweinfurthi Quaas 1902
†Trigonarca sectilis Packard 1922
†Trigonarca semiglabra von Koenen 1897