The type specimen of Brachyrhizodus Romer 1942, B. wichataensis Romer 1942, (which was originally found in Carboniferous-Permian sediments and provisionally identified as a petalodont) was a reworked Cretaceous tooth element. The duplicate listing of a "Permian petalodont" Brachyrhizodus in Sepkoski's Genus Compendium did not recognize the latter awareness that the specimen was reworked and genus is restricted to the Cretaceous.

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Brachyrhizodus was named by Romer (1942) [Sepkoski's age data: K Camp K Maes Sepkoski's reference number: 884].

It was assigned to Myliobatinae by Cappetta and Case (1975); to Myliobatiformes by Sepkoski (2002), Adnet et al. (2012); and to Myliobatidae by Cappetta (1987), Case and Schwimmer (1988), Claeson et al. (2010), Cicimurri et al. (2014), van der Laan (2019), De Pasqua et al. (2025).