| ![Animal picture.](../images/life/tetrapoda/sauropsida/blezingeria.jpg) Thalattosauria †Blezingeria |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/askeptosaurus.jpg) Thalattosauria | Askeptosauroidea †Askeptosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/endennasaurus.jpg) Thalattosauria | Askeptosauroidea †Endennasaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/anshunsaurus.jpg) Thalattosauria | Askeptosauroidea †Anshunsaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/miodentosaurus.jpg) Thalattosauria | Askeptosauroidea †Miodentosaurus |
| Thalattosauria | Thalattosauroidea †Gunakadeit |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/thalattosaurus.jpg) Thalattosauria | Thalattosauroidea †Thalattosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/nectosaurus.jpg) Thalattosauria | Thalattosauroidea †Nectosaurus |
| Thalattosauria | Thalattosauroidea †Paralonectes |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/concavispina.jpg) Thalattosauria | Thalattosauroidea †Concavispina |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/xinpusaurus.jpg) Thalattosauria | Thalattosauroidea †Xinpusaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/clarazia.jpg) Thalattosauria | Thalattosauroidea | Claraziidae †Clarazia |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/hescheleria.jpg) Thalattosauria | Thalattosauroidea | Claraziidae †Hescheleria |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/chaohusaurus.jpg) Ichthyosauromorpha †Chaohusaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/eohupehsuchus.jpg) Ichthyosauromorpha | Hupehsuchia †Eohupehsuchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/nanchangosaurus.jpg) Ichthyosauromorpha | Hupehsuchia | Nanchangosauridae †Nanchangosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/hupehsuchus.jpg) Ichthyosauromorpha | Hupehsuchia | Hupehsuchidae †Hupehsuchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/parahupehsuchus.jpg) Ichthyosauromorpha | Hupehsuchia | Hupehsuchidae | Parahupehsuchinae †Parahupehsuchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/eretmorhipis.jpg) Ichthyosauromorpha | Hupehsuchia | Hupehsuchidae | Parahupehsuchinae †Eretmorhipis |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/cartorhynchus.jpg) Ichthyosauromorpha | Ichthyosauriformes | Nasorostra †Cartorhynchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/sclerocormus.jpg) Ichthyosauromorpha | Ichthyosauriformes | Nasorostra †Sclerocormus |
| Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia †Isfjordosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/omphalosaurus.jpg) Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia | Omphalosauridae †Omphalosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/tholodus.jpg) Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia | Omphalosauridae †Tholodus |
| Ichthyosauromorpha| Ichthyosauriformes | Ichthyopterygia | Parvinatatoridae †Parvinatator |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/thaisaurus.jpg) Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia | Thaisauridae †Thaisaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/utatsusaurus.jpg) Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia | Utatsusauridae †Utatsusaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/grippia.jpg) Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia | Eoichthyosauria | Grippida †Grippia |
| Ichthyosauromorpha | Ichthyosauriformes | Ichthyopterygia | Eoichthyosauria | Grippida †Gulosaurus |
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| ![Animal picture.](../images/life/tetrapoda/sauropsida/prolacerta.jpg) Sauria | Leipidosauromorpha †Prolacerta |
| Sauria | Leipidosauromorpha †Cargninia |
| Sauria | Leipidosauromorpha †Coartaredens |
| Sauria | Leipidosauromorpha †Feralisaurus |
| Sauria | Leipidosauromorpha †Fraxinisaura |
| Sauria | Leipidosauromorpha †Lacertulus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/marmoretta.jpg) Sauria | Leipidosauromorpha †Marmoretta |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/megachirella.jpg) Sauria | Leipidosauromorpha †Megachirella |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/paliguana.jpg) Sauria | Leipidosauromorpha †Paliguana |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/sophineta.jpg) Sauria | Leipidosauromorpha †Sophineta |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/tamaulipasaurus.jpg) Sauria | Leipidosauromorpha †Tamaulipasaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/taytalura.jpg) Sauria | Leipidosauromorpha †Taytalura |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/vellbergia.jpg) Sauria | Leipidosauromorpha †Vellbergia |
| Sauria | Leipidosauromorpha †Vinitasaura |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/icarosaurus.jpg) Sauria | Leipidosauromorpha | Kuehneosauridae †Icarosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/kuehnosuchus.jpg) Sauria | Leipidosauromorpha | Kuehneosauridae †Kuehneosuchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/kuehnosaurus.jpg) Sauria | Leipidosauromorpha | Kuehneosauridae †Kuehneosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/pamelina.jpg) Sauria | Leipidosauromorpha | Kuehneosauridae †Pamelina |
| Sauria | Leipidosauromorpha | Kuehneosauridae †Rhabdopelix |
| Sauria | Leipidosauromorpha | Choristodera †Pachystropheus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/coeruleodraco.jpg) Sauria | Leipidosauromorpha | Choristodera †Coeruleodraco |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/cteniogenys.jpg) Sauria | Leipidosauromorpha | Choristodera †Cteniogenys |
| Sauria | Leipidosauromorpha | Choristodera †Heishanosaurus |
| Sauria | Leipidosauromorpha | Choristodera †Irenosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/lazarussuchus.jpg) Sauria | Leipidosauromorpha | Choristodera | Allochoristodera †Lazarussuchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/monjurosuchus.jpg) Sauria | Leipidosauromorpha | Choristodera | Allochoristodera †Monjurosuchus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/philydrosaurus.jpg) Sauria | Leipidosauromorpha | Choristodera | Allochoristodera †Philydrosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/hyphalosaurus.jpg) Sauria | Leipidosauromorpha | Choristodera | Allochoristodera †Hyphalosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/khurendukhosaurus.jpg) Sauria | Leipidosauromorpha | Choristodera | Allochoristodera †Khurendukhosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/shokawa.jpg) Sauria | Leipidosauromorpha | Choristodera | Allochoristodera †Shokawa |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/champsosaurus.jpg) Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Champsosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/kosmodraco.jpg) Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Kosmodraco |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/ikechosaurus.jpg) Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Ikechosaurus |
| Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Liaoxisaurus |
| Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Mengshanosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/simoedosaurus.jpg) Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Simoedosaurus |
| ![Animal picture.](../images/life/tetrapoda/sauropsida/tchoiria.jpg) Sauria | Leipidosauromorpha | Choristodera | Neochoristodera †Tchoiria |
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