Classification of Patton and Taylor 1971
G. †Prosynthetoceras Frick 1937
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†Prosynthetoceras francisi Frick 1937
†Prosynthetoceras hessei Stirton 1967
†Prosynthetoceras texanus Hay 1924
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Invalid names: Dromomeryx angustidens Hay 1924 [synonym], Merycodus grandis Hay 1924 [synonym], Syndyoceras australis White 1941 [synonym], Synthetoceras (Prosynthetoceras) douglasi White 1947 [synonym], Synthetoceras rileyi Frick 1937 [synonym]
†Prosynthetoceras trinitiensis Patton and Taylor 1971
Invalid names: Lambdoceras Stirton 1967 [synonym]