O'Keefe, F. R. 2004 Preliminary description and phylogenetic position of a new plesiosaur (Reptilia: Sauropterygia) from the Toarcian of Holzmaden, Germany Journal of Paleontology 78 973-988 Simosaurus Cymatosaurus Pistosauridae Muraenosaurus Cryptocleidus Tricleidus Kimmerosaurus Morturneria Edgarosaurus_MOR_751 Polycotylus Dolichorhynchops Trinacromerum Libonectes Styxosaurus Callawayasaurus_was_Alzadasaurus Brancasaurus Microcleidus Plesiosaurus Plesiopterys Thalassiodracon Eurycleidus Attenborosaurus Yorkshire_taxon_BMNH_R_dot_5488 Hauffiosaurus Kronosaurus Peloneustes Liopleurodon Pliosaurus Brachauchenius Rhomaleosaurus_megacephalus Rhomaleosaurus_victor Macroplata Rhomaleosaurus_zetlandicus Simolestes Leptocleidus Osteology Maximum Parsimony Based on reanalysis of the original matrix. OKeefe_2004a