Classification of the genus Protacanthoceras
G. †Protacanthoceras Spath 1923
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†Protacanthoceras alzadense Cobban 1987
†Protacanthoceras bunburianus Sharpe 1853
†Protacanthoceras fisherense Cobban 1987
†Protacanthoceras hosei sheridanense Cobban 1987
†Protacanthoceras involutum Thomel 1972
†Protacanthoceras proteus Wright and Kennedy 1980
†Protacanthoceras proteus vascoceratoides Wright and Kennedy 1987
†Protacanthoceras tuberculatum Thomel 1972
†Protacanthoceras vetula Cobban 1987