Classification of Adams 1997
Fm. †Polycotylidae Williston 1908
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G. †Polycotylus Cope 1869
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†Polycotylus dolichopus Williston 1906
†Polycotylus ichthyospondylus Seeley 1869
†Polycotylus latipinnis Cope 1869
†Polycotylus tenuis Hector 1874
Invalid names: Polycotylus balticus Schröder 1885 [nomen dubium], Polycotylus brevispondylus Bogolubov 1911 [nomen dubium], Polycotylus donicus Pravoslavlev 1915 [nomen dubium], Polycotylus orientalis Bogolubov 1911 [nomen dubium], Polycotylus ultimus Bogolubov 1911 [nomen dubium]
G. †Trinacromerum Cragin 1888
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†Trinacromerum anonymum Williston 1903
†Trinacromerum bentonianum Cragin 1888
†Trinacromerum bonneri Adams 1997
†Trinacromerum brownorum Thurmond 1968
†Trinacromerum kirki Russell 1935
†Trinacromerum latimanus Williston 1908
†Trinacromerum osborni Williston 1902