Classification of the genus Gnamptorhynchos
G. †Gnamptorhynchos Jin 1989
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†Gnamptorhynchos globatum Twenhofel 1928
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Invalid names: Gnamptorhynchos inversum Jin 1989 [synonym]
†Gnamptorhynchos manitobensis Jin and Zhan 2000
†Gnamptorhynchos orbiculoidea Jin and Chatterton 1997
†Gnamptorhynchos prayi Howe 1966
†Gnamptorhynchos rhynchonelliformis McEwan 1919
†Gnamptorhynchos selliseptalicium Jin 1989