Sauropterygia
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| - Alexeyisaurus
- Atopodentatus
- Helveticosauridae?
- Saurosphargidae?
- Thalattosauria?
| Placodontiformes | | | | Cyamodontoidea | - Psephosauriscus
- Psephosaurus
| Cyamodontida | |
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Placochelyida | Henodontidae | |
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Placochelyidae | - Glyphoderma
- Macroplacus
- Placochelys
- Psephochelys
- Psephoderma
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Eosauropterygia |
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Eosauropterygia | Pachypleurosauria/Pachypleurosauridae | - Anarosaurus
- Dactylosaurus
- Diandongosaurus
- Dianmeisaurus
- Dianopachysaurus
- Hanosaurus
- Keichousaurus
- Majiashanosaurus
- Neusticosaurus
- Odoiporosaurus
- Panzhousaurus
- Qianxisaurus
- Serpianosaurus
- Wumengosaurus
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| Eusauropterygia | - Brevicaudosaurus
- Corosaurus
- Cymatosaurus
- Pachypleurosauria?
| Nothosauroidea | - Dawazisaurus?
- Sanchiaosaurus
- Pachypleurosauria?
| Nothosauria | Simosauridae | |
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Nothosauridae | - Germanosaurus
- Metanothosaurus
- Nothosaurus
- Proneusticosaurus
| Lariosaurinae | - Ceresiosaurus
- Lariosaurus
- Silvestrosaurus
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Pistosauroidea | - Chinchenia
- Kwangsisaurus
- Tanaisosaurus
- Wangosaurus
| Pistosauria | - Augustasaurus
- Bobosaurus
- Pistosaurus
- Yunguisaurus
| Plesiosauria | |
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| - Anningasaura
- Bobosaurus?
- Lindwurmia
- Termatosaurus?
| Rhomaleosauridae | - Anningasaura?
- Archaeonectrus
- Atychodracon
- Avalonnectes
- Bishanopliosaurus?
- Borealonectes
- Eurycleidus
- Macroplata
- Maresaurus
- Meyerasaurus
- Rhomaleosaurus
- Sthenarosaurus
- Thaumatodracon
- Yuzhoupliosaurus?
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| Neoplesiosauria | Pliosauroidea | - Bathyspondylus
- Sinopliosaurus
- Rhomaleosauridae?
| Eupliosauria | | Pliosauridae | - Anguanax
- Arminisaurus
- Attenborosaurus
- Cryonectes
- Hauffiosaurus
- Marmornectes
- Pachycostasaurus
- Rhaeticosaurus
- Thalassiodracon
| Thalassophonea | | Brachaucheninae | - Acostasaurus
- Brachauchenius
- Kronosaurus
- Luskhan
- Makhaira
- Megacephalosaurus
- Polyptychodon
- Sachicasaurus
- Stenorhynchosaurus
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Plesiosauroidea | - Eoplesiosaurus
- Eretmosaurus
- Leurospondylus
- Plesiopharos
- Plesiopterys
- Plesiosaurus
- Westphaliasaurus
| Microcleididae | - Hydrorion
- Lusonectes
- Microcleidus
- Occitanosaurus
- Seeleyosaurus
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Cryptoclidia | |
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Cryptoclidia |
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Cryptoclididae | - Djupedalia
- Opallionectes
- Pantosaurus
- Spitrasaurus
| Cryptoclidinae | - Abyssosaurus
- Colymbosaurus
- Cryptoclidus
- Kimmerosaurus
- Ophthalmothule
- Tatenectes
- Tricleidus
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Muraenosaurinae | - Muraenosaurus
- Picrocleidus
- Vinialesaurus
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| Xenopsaria | Leptocleidia | - Hastanectes?
- Nichollssaura?
| Leptocleididae | - Brancasaurus
- Hastanectes?
- Leptocleidus
- Nichollssaura?
- Umoonasaurus?
- Vectocleidus
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Polycotylidae | - Dolichorhynchops
- Edgarosaurus
- Eopolycotylus
- Georgiasaurus
- Manemergus
- Mauriciosaurus
- Pahasapasaurus
- Palmulasaurus
- Plesiopleurodon
- Polycotylus
- Rarosaurus
- Sulcusuchus
- Thililua
- Trinacromerum
- Umoonasaurus?
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| Elasmosauridae | - Callawayasaurus
- Cimoliasaurus
- Eromangasaurus
- Fresnosaurus
- Goniosaurus
- Jucha
- Lagenanectes
- Leivanectes
- Mauisaurus
- Ogmodirus
- Orophosaurus
- Scanisaurus
- Wapuskanectes
- Woolungasaurus
- Zarafasaura
| Euelasmosaurida | | Elasmosaurinae | - Albertonectes
- Elasmosaurus
- Fluvionectes
- Hydrotherosaurus
- Nakonanectes
- Styxosaurus
- Terminonatator
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Weddellonectia | - Aphrosaurus
- Futabasaurus
- Kawanectes
- Morenosaurus
- Tuarangisaurus
- Vegasaurus
| Aristonectinae | - Alexandronectes
- Aristonectes
- Kaiwhekea
- Morturneria
- Wunyelfia
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