Rhaeticosaurus Exter Formation Pliosauroidea Timeline of plesiosaur research Pliosauridae Brevicaudosaurus Picrocleidus Panzhousaurus Majiashanosaurus Pantosaurus Aristonectinae Djupedalia Placochelyidae Pachycostasaurus Sthenarosaurus Morturneria Raptocleidus Hanosaurus Leptocleidia Lagenanectes Bobosaurus Plesiopterys Fluvionectes Hastanectes Kwangsisaurus Terminonatator Psephochelys Gallardosaurus Cryonectes Mauisaurus Makhaira rossica Vinialesaurus Pahasapasaurus Ogmodirus Qianxisaurus Tricleidus Nakonanectes Pomolispondylus Lindwurmia Borealonectes Aristonectidae Alexeyisaurus Placodus Trinacromerum Keichousau…

urus Hispaniasaurus Plesioelasmosaurus Chusaurus Stauromatodon Wunyelfia Placochelys Aphrosaurus Trematospondylus Morenosaurus Opallionectes Jucha Franconiasaurus Sulcusuchus Edgarosaurus Ophthalmothule Paludidraco Westphaliasaurus Woolungasaurus Dactylosaurus Serpentisuchops Goniosaurus Georgiasaurus Psephosauriscus Cymatosaurus Polyptychodon Wapuskanectes Henodontidae Macroplacus Eiectus Dawazisaurus Sinopliosaurus Orophosaurus Prosantosaurus Vectocleidus Anarosaurus Helveticosaurus Anguanax Spitrasaurus Placodontiformes Thalassomedon Leurospondy

lus Maresaurus Cyamodontoidea Pistosauroidea Cardiocorax Atopodentatus Plesiopharos Sanchiaosaurus Palatodonta Alexandronectes Eopolycotylus Eretmosaurus Eromangasaurus Leptocleidus Hydrorion Honghesaurus Yuzhoupliosaurus Diandongosaurus Helveticosauridae Lusonectes Luopingosaurus Plesiopleurodon Silvestrosaurus Cimoliasaurus Kimmerosaurus Yunguisaurus Eusaurosphargis Kaiwhekea Arminisaurus Scalamagnus Muraenosaurus Psephoderma Placodontia Augustasaurus Nothosaur Odoiporosaurus Palmulasaurus Simosaurus Manemergus Brachauchenius Mauriciosaurus Avalonnectes Marmornectes Vegasaurus Stratesaurus Thililua Monquirasaurus Wangosaurus Fresnosaurus Sinocyamodus P