Status of the pachycephalosauroid <em>Psilotrachelosaurus toeplitschi</em> Nopcsa (Reptilia, Sauropterygia), from the Middle Triassic of Austria

Rieppel, O. 1993 Status of the pachycephalosauroid <em>Psilotrachelosaurus toeplitschi</em> Nopcsa (Reptilia, Sauropterygia), from the Middle Triassic of Austria Fieldiana: Geology, New Series 27 1-17 Petrolacosaurus Claudiosaurus Youngina Keichousaurus Dactylosaurus Anarosaurus Psilotrachelosaurus Serpianosaurus N_pusillus N_peyeri N_edwardsii Osteology Maximum Parsimony Based on reanalysis of the original matrix. Rieppel_1993a