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| - Alexeyisaurus
- Hanosaurus
- Pomolispondylus
- Helveticosauridae?
- Saurosphargidae?
- Thalattosauria?
| Placodontiformes | - Atopodentatus?
- Palatodonta
| | | 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
- Chusaurus
- Dactylosaurus
- Diandongosaurus
- Dianmeisaurus
- Dianopachysaurus
- Hanosaurus?
- Honghesaurus
- Keichousaurus
- Luopingosaurus
- Majiashanosaurus
- Neusticosaurus
- Odoiporosaurus
- Prosantosaurus
- Panzhousaurus
- Qianxisaurus
- Serpianosaurus
- Wumengosaurus
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| Eusauropterygia | |
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| - Anningasaura
- Bobosaurus?
- Lindwurmia
- Termatosaurus?
| Rhomaleosauridae | - Anningasaura?
- Archaeonectrus
- Atychodracon
- Avalonnectes
- Bishanopliosaurus?
- Borealonectes
- Eurycleidus
- Lindwurmia?
- Macroplata
- Maresaurus
- Meyerasaurus
- Rhomaleosaurus
- Sthenarosaurus
- Thaumatodracon
- Yuzhoupliosaurus?
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| | | | Eupliosauria | | Pliosauridae | - Anguanax
- Arminisaurus
- Attenborosaurus
- Cryonectes
- Hauffiosaurus
- Marmornectes
- Pachycostasaurus
- Rhaeticosaurus
- Thalassiodracon
| Thalassophonea | | Brachaucheninae | - Acostasaurus
- Brachauchenius
- Eiectus
- Kronosaurus
- Luskhan
- Makhaira
- Megacephalosaurus
- Monquirasaurus
- 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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| Xenopsaria | Leptocleidia | | Leptocleididae | - Brancasaurus
- Hastanectes?
- Leptocleidus
- Nichollssaura?
- Umoonasaurus?
- Vectocleidus
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Polycotylidae | - Edgarosaurus
- Manemergus
- Thililua
| Palmulasaurinae | - Pahasapasaurus?
- Palmulasaurus
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Occultonectia | |
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Polycotylinae | - Dolichorhynchops
- Eopolycotylus
- Georgiasaurus
- Mauriciosaurus
- Polycotylus
- Serpentisuchops
- Trinacromerum
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| Elasmosauridae | - Callawayasaurus
- Cimoliasaurus
- Eromangasaurus
- Goniosaurus
- Jucha
- Lagenanectes
- Leivanectes
- Mauisaurus
- Ogmodirus
- Orophosaurus
- Plesioelasmosaurus
- Scanisaurus
- Wapuskanectes
- Woolungasaurus
| Euelasmosaurida | - Cardiocorax
- Libonectes
- Thalassomedon
| Elasmosaurinae | |
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Weddellonectia | - Aphrosaurus
- Chubutinectes
- Futabasaurus
- Fresnosaurus?
- Hydrotherosaurus?
- Kawanectes
- Morenosaurus
- Tuarangisaurus
- Vegasaurus
- Zarafasaura?
| Aristonectinae | - Alexandronectes
- Aristonectes
- Kaiwhekea
- Morturneria
- Wunyelfia
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