Classification of the genus Trapezium
G. Trapezium Mühlfeld 1811
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Subg. Trapezium (Neotrapezium) Habe 1951
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†Neotrapezium californicum Squires 1999
†Trapezium (Neotrapezium) kobe Matsubara et al. 2010
Subg. †Trapezium (Schedotrapezium) Stewart 1930
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†Trapezium (Schedotrapezium) carinatum Gabb 1864
†Trapezium auberti Abrard 1942
†Trapezium claibornense Dall 1903
†Trapezium daviesi Cox 1930
†Trapezium diversicostulatum Imlay 1940
†Trapezium insepultum White 1887
†Trapezium lycetti Cossmann 1907
†Trapezium sublaevigatum Lamarck 1819
†Trapezium subtriangulum Imlay 1940