| Quasianosteosauridae †Quasianosteosaurus |
| Hueneosauria | Mixosauria | Wimaniidae †Wimanius |
|  Hueneosauria | Mixosauria | Mixosauridae | Mixosaurinae †Barracudasauroides |
|  Hueneosauria | Mixosauria | Mixosauridae | Mixosaurinae †Mixosaurus |
|  Hueneosauria | Mixosauria | Mixosauridae | Phalarodontidae †Contectopalatus |
|  Hueneosauria | Mixosauria | Mixosauridae | Phalarodontidae †Phalarodon |
|  Hueneosauria | Longipinnati | Toretocnemidae †Qianichthyosaurus |
|  Hueneosauria | Longipinnati | Toretocnemidae †Toretocnemus |
|  Hueneosauria | Longipinnati | Cymbospondylidae †Cymbospondylus |
| Hueneosauria | Longipinnati | Merriamosauria †Pessosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria †Thalattoarchon |
| Hueneosauria | Longipinnati | Merriamosauria | Merriamosauridae †Pessopteryx |
|  Hueneosauria | Longipinnati | Merriamosauria | Besanosauridae †Besanosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Shastasauridae †Himalayasaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Shastasauridae †Shastasaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Shonisauridae †Shonisaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Californosauridae †Californosaurus |
| Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria †Callawayia |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria †Guizhouichthyosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria †Mikadocephalus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Hudsonelpidiidae †Hudsonelpidia |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Macgowaniidae †Macgowania |
| Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria †Dearcmhara |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria †Hauffiopteryx |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Temnodontosauridae †Temnodontosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Leptonectidae †Eurhinosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Leptonectidae †Excalibosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Leptonectidae †Leptonectes |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Leptonectidae †Wahlisaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Suevoleviathanidae †Suevoleviathan |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Ichthyosauridae †Protoichthyosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Ichthyosauridae †Ichthyosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Ichthyosauridae †Malawania |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia †Chacaicosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Stenopterygiidae †Magnipterygius |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Stenopterygiidae †Stenopterygius |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae †Arthropterygius |
| Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Ophthalmosaurinae †Mollesaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Ophthalmosaurinae †Ophthalmosaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Ophthalmosaurinae †Baptanodon |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Ophthalmosaurinae †Acamptonectes |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Brachypterygius |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Maiaspondylus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Aegirosaurus |
| Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Sveltonectes |
| Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Platypterygius |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Caypullisaurus |
|  Hueneosauria | Longipinnati | Merriamosauria | Euichthyosauria | Parvipelvia | Neoichthyosauria | Thunnosauria | Baracromia | Ophthalmosauridae | Platypterygiinae †Athabascasaurus |