Taxonomy
The classification of plesiosauroids has varied; the following represents one version (see Evans 2012)
- Superorder SAUROPTERYGIA
- Order PLESIOSAURIA
- Suborder Pliosauroidea
- Suborder Plesiosauroidea
- ? Leurospondylus
- Eoplesiosaurus
- Eretmosaurus
- Westphaliasaurus
- Family Plesiosauridae
- Plesiosaurus
- Euplesiosauria
- Family Microcleididae
- Hydrorion
- Lusonectes
- Microcleidus
- Occitanosaurus
- Seeleyosaurus
- Family Cryptoclididae
- ?Abyssosaurus
- Opallionectes
- Pantosaurus
- Picrocleidus
- Plesiopterys
- Scanisaurus
- Subfamily Cryptoclidinae
- Colymbosaurus
- Cryptoclidus
- Kimmerosaurus
- Tatenectes
- Tricleidus
- Subfamily Muraenosaurinae
- Muraenosaurus
- Tremamesacleis
- Vinialesaurus
- Family Elasmosauridae
- Albertonectes
- Aphrosaurus
- Callawayasaurus
- Elasmosaurus
- Eromangasaurus
- Fresnosaurus
- Futabasaurus
- Hydralmosaurus
- Hydrotherosaurus
- Libonectes
- Mauisaurus
- Styxosaurus
- Terminonatator
- Thalassomedon
- Tuarangisaurus
- Wapuskanectes
- Zarafasaura
- Subfamily Aristonectinae
- Aristonectes
- Kaiwhekea
- Dubious Elasmosaurids
- Cimoliasaurus
- Goniosaurus
- Ogmodirus
- Orophosaurus
- Piptomerus
- Woolungasaurus
- Family Microcleididae
- Order PLESIOSAURIA
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