Classification of the genus Prothalassoceras
G. †Prothalassoceras Böse 1919
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†Prothalassoceras bashkiricum Ruzhentsev 1950
†Prothalassoceras biforme Gerassimov 1937
†Prothalassoceras bostocki Nassichuk 1971
†Prothalassoceras caddoense Plummer and Scott 1937
†Prothalassoceras dieneri Smith 1927
†Prothalassoceras inflatum Ruzhentsev 1950
†Prothalassoceras jaikense Ruzhentsev 1950
†Prothalassoceras kingorum Miller 1930
†Prothalassoceras notabile Bogoslovskaya et al. 1995
†Prothalassoceras serratum Maximova 1948
†Prothalassoceras solitum Ruzhentsev 1978
†Prothalassoceras umbilicatum Ruzhencev 1952
†Prothalassoceras welleri Böse 1919
Invalid names: Allothalassoceras Leonova 2002 [synonym]