Classification of McGowran 1959
G. †Cimomia Conrad 1866
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†Cimomia felix Chapman 1915
†Cimomia yorkensis McGowran 1959
G. †Eutrephoceras Hyatt 1894
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†Eutrephoceras altifrons Chapman 1915
†Eutrephoceras geelongensis Foord 1891