Classification of the genus Helohyus
G. †Helohyus Marsh 1872
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Invalid names: Ithygrammodon cameloides Osborn et al. 1878 [nomen dubium], Lophiohyus Sinclair 1914 [synonym], Thinotherium Marsh 1872 [synonym], Thinotherium Cope 1870 [synonym]