Classification of the genus Hypengonoceras
G. †Hypengonoceras Spath 1922
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†Hypengonoceras chouberti Collignon 1966
†Hypengonoceras decaryi Collignon 1963
†Hypengonoceras fauremuretae Collignon 1966
†Hypengonoceras tarfayense Collignon 1966
†Hypengonoceras warthi Kossmat 1895