Sauropterygia (Taxonomic Rank: Suborder)
Extinct aquatic diapsid reptiles including the Plesiosauria, Nothosauria, Pachypleurosauria, Placodontiformes, and relatives.

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	Abyssosaurus Acostasaurus Albertonectes Alexandronectes Alexeyisaurus Alzadasaurus Anarosaurus Anguanax Anningasaura Anomosaurus Apatomerus Aphrosaurus Apractocleidus Aptychodon Archaeonectrus Aristonectes Arminisaurus Atopodentatus Attenborosaurus Atychodracon Augustasaurus Avalonnectes Bathyspondylus Bishanopliosaurus Bobosaurus Borealonectes Brachauchenius Brancasaurus Brevicaudosaurus Brimosaurus Callawayasaurus Cardiocorax Ceraunosaurus Ceresiosaurus Chubutinectes Chusaurus Cimoliasaurus Colymbosaurus Crymocetus Cryonectes Cryptoclidus Dactylosaurus Dawazisaurus Diandongosaurus Dianmeisaurus Dianopachysaurus Discosaurus Djupedalia Dolichorhynchops Eardasaurus Edgarosaurus Eiectus Elasmosaurus Embaphias Eoplesiosaurus Eopolycotylus Eretmosaurus Eromangasaurus Eupodosaurus Eurycleidus Eurysaurus Fluvionectes Franconiasaurus Fresnosaurus Futabasaurus Gallardosaurus Georgiasaurus Germanosaurus Goniosaurus Gronausaurus Hanosaurus Hastanectes Hauffiosaurus Henodus Hexatarsostinus Honghesaurus Hydralmosaurus Hydrorion Hydrotherosaurus Jucha Kaiwhekea Kawanectes Keichousaurus Kimmerosaurus Kolposaurus Kronosaurus Lagenanectes Lariosaurus Leivanectes Leptocleidus Leurospondylus Libonectes Lindwurmia Liopleurodon Lorrainosaurus Luetkesaurus Luopingosaurus Luskhan Lusonectes Macroplata Majiashanosaurus Makhaira Manemergus Marambionectes Maresaurus Marmornectes Martinectes Mauisaurus Mauriciosaurus Megacephalosaurus Megalneusaurus Meyerasaurus Microcleidus Monquirasaurus Morenosaurus Morturneria Muraenosaurus Nakonanectes Neusticosaurus Nichollssaura Nothosaurus Occitanosaurus Odoiporosaurus Ogmodirus Opallionectes Ophthalmothule Orophosaurus Pachycostasaurus Pahasapasaurus Palmulasaurus Pantosaurus Panzhousaurus Peloneustes Pentatarsostinus Peyerus Picrocleidus Piptomerus Piratosaurus Pistosaurus Placochelys Placodus Plesioelasmosaurus Plesiopharos Plesiopleurodon Plesiopterys Plesiosaurus Pliosaurus Polycotylus Polyptychodon Prosantosaurus Qianxisaurus Rhaeticosaurus Rhomaleosaurus Sachicasaurus Scalamagnus Scanisaurus Seeleyosaurus Serpentisuchops Serpianosaurus Silvestrosaurus Simolestes Simosaurus Sinopliosaurus Spitrasaurus Spondylosaurus Stenorhynchosaurus Stereosaurus Sthenarosaurus Stratesaurus Stretosaurus Strongylokrotaphus Styxosaurus Sulcusuchus Taphrosaurus Tatenectes Terminonatator Thalassiodracon Thalassiosaurus Thalassomedon Thaumatodracon Thaumatosaurus Thililua Tremamesacleis Tricleidus Trinacromerum Tuarangisaurus Umoonasaurus Unktaheela Uronautes Vectocleidus Vegasaurus Vinialesaurus Westphaliasaurus Woolungasaurus Wumengosaurus Wunyelfia Yunguisaurus Yuzhoupliosaurus Zarafasaura

= Extinct Life Forms   = Living Creatures   = Fictional Beasts   = Inanimate Objects   = Ethereal Entities    = At least one collectible is catalogued