Pantelosaurus

Pantelosaurus (meaning "complete lizard") is an extinct genus of basal sphenacodont known from the Early Permian period (Asselian stage) of Saxony, Germany. It contains a single species, Pantelosaurus saxonicus.

Discovery
Pantelosaurus is known from about 6 individuals including skulls and partial postcranial skeletons. All specimens were collected at Königin-Carola-Schacht locality, in Dresden, from the uppermost part of the Döhlen Formation, lower Rotliegend Group (Döhlen Basin), dating to the Asselian stage of the Cisuralian series, about 299-296.4 million years old.

Description
Pantelosaurus was first described by von Huene (1925) as a pelycosaur. In 1940, Alfred Sherwood Romer & Llewellyn Price revised the taxonomy of pelycosaurs and synonymized Pantelosaurus with Haptodus, creating the new combination Haptodus saxonicus. After describing a new species of Haptodus in 1977, Currie (1979) synonymized all European haptodontines, as well as Cutleria wilmarthi, with the type of the genus, H. baylei. Later, Laurin (1993 and 1994) considered Haptodontinae to represent a polyphyletic grade of basal sphenacodonts, and revalidated Pantelosaurus among other genera and species. His revision has been accepted since.[3] Only three phylogenetic analyses included Pantelosaurus. Laurin (1994), Fröbisch et al. (2011) and Benson (in press) recovered it as a basal sphenacodont, more derived then Haptodus garnettensis (Currie, 1977) or in a polytomy with it.[1][2][4] The cladogram below shows Pantelosaurus phylogenetic position among other synapsids following Benson (in press).