Storrs, G. W. 1991 Anatomy and relationships of <em>Corosaurus alcovensis</em> (Diapsida: Sauropterygia) and the Triassic Alcova Limestone of Wyoming Bulletin of the Peabody Museum of Natural History 44 1-151 Captorhinomorpha Petrolacosaurus Younginiformes Claudiosaurus Pachypleurosaurus Neusticosaurus Serpianosaurus Anarosaurus Dactylosaurus Keichousaurus Placodontia Simosaurus Corosaurus Ceresiosaurus Lariosaurus Cymatosaurus Nothosaurus Paranothosaurus Pistosaurus Plesiosauroidea Piiosauroidea Osteology Maximum Parsimony Based on reanalysis of the original matrix. Storrs_1991a