Sphodrosaurus
Sphodrosaurus is an extinct genus of basal archosauriform reptiles from the Late Triassic-aged New Oxford Formation of Pennsylvania. The type species is S. pennsylvanicus, described by Edwin Colbert in 1960. The holotype consists of a partial skeleton including the back of the skull, the vertebral column, all of the ribs, all of the hindlimbs and part of the upper forelimbs; Sphodrosaurus was originally believed to have been a member of the Procolophonidae while more recently Sphodrosaurus was believed to be a basal member of the Diapsida by most authors starting with Sues et al., or a member of the Rhynchosauria. In 2022, Ezcurra & Sues redescribed the holotype in detail and placed it in a phylogenetic analysis with other Triassic diapsid reptiles, where it was found as the basalmost doswellid.