It was originally described in 1905 on a basis of a specimen from late Carboniferous deposits in Poland.[1] It was later considered a synonym of Haptodus by several authors, but subsequent examination has found it be a caseid rather a sphenacodont.[2] This was confirmed by cladistic analysis, which recovered Datheosaurus as a basal caseid[3]
Restoration
References
^H. Schroeder. 1905. Datheosaurus macrourus nov. gen. nov. sp. aus dem Rotliegenden von Neurode. Jahrbuch der Königlich Preussischen Geologischen Landesanstalt und Bergakademie 25(2):282-294