Datheosaurus ("Dathe's lizard") is an extinct genus of caseasaur. It was at least in length. It lived during the Latest Carboniferous to Early Permian in Poland. It was named for Ernst Dathe (1845–1917), the German geologist who first announced the fossil find.
Discovery and history It was originally described in 1905 on a basis of a specimen from late Carboniferous deposits in Poland.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 It was later considered a synonym of Haptodus by several authors, but subsequent examination has found it be a caseid rather a sphenacodont. This was confirmed by cladistic analysis, which recovered Datheosaurus as a basal caseid
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