Classification of Stephenson 1955

G. †Acanthoceras Neumayr 1875
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†Acanthoceras johnsonanum Stephenson 1955
G. †Eucalycoceras Spath 1923
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†Eucalycoceras barcusi Jones 1938
G. †Euomphaloceras Spath 1923
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†Euomphaloceras lonsdalei Adkins 1928
G. †Tarrantoceras Stephenson 1955
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Subg. †Tarrantoceras (Tarrantoceras) Stephenson 1955
†Tarrantoceras sellardsi Adkins 1928