Classification of the genus Tarrantoceras
G. †Tarrantoceras Stephenson 1955
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Subg. †Tarrantoceras (Sumitomoceras) Matsumoto 1969
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†Sumitomoceras bentonianum Cragin 1893
†Sumitomoceras conlini Wright and Kennedy 1981
†Tarrantoceras (Sumitomoceras) faustum Matsumoto 1969
Subg. †Tarrantoceras (Tarrantoceras) Stephenson 1955
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†Tarrantoceras (Tarrantoceras) sellardsi Adkins 1928
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Invalid names: Tarrantoceras lillianense Stephenson 1955 [synonym], Tarrantoceras multicostatum Stephenson 1955 [synonym], Tarrantoceras rotatile Stephenson 1955 [synonym], Tarrantoceras stantoni Stephenson 1955 [synonym]
†Tarrantoceras cuspidum Stephenson 1953
†Tarrantoceras exile Kennedy and Cobban 1990
†Tarrantoceras flexicostatum Cobban 1988