Sauropsida phylogeny

From Palaeos

o Amniota   (Reptilia grade begins here)
|--o SAUROPSIDA = Reptilia when Mesosaurs are placed within Parareptiles (clade)
|  |?--Mesosauria
|  |--o Anapsida/Parareptilia
|  `--o Eureptilia
|     |--Captorhinidae
|     `--o=="Protorothyrididae" (grade)
|        `--Diapsida
`--Synapsida

[edit] Phylogenetic Tree

o Cotylosauria
|--Diadectomorpha
`--o Amniota   (Reptilia (grade begins here)
   |--o SAUROPSIDA  (= Reptilia (clade)
   |  |--o Anapsida/Parareptilia
   |  |  |?--Mesosauria
   |  |  |--Bolosauridae
   |  |  `--o Procolophonia
   |  |     |--Pareiasauria 
   |  |     `?--Testudines
   |  `--o--Captorhinidae
   |     `--o--Protorothyrididae
   |        `--o Diapsida
   |           |--Araeoscelida
   |           `--o--Younginiformes
   |              `--+--Ichthyosauria
   |                 `--o--Lepidosauromorpha
   |                    |?--Testudines
   |                    `--Archosauromorpha  
   `--Synapsida

notes:

• The position of the Testudines (turtles) is controversial; two alternatives are given here.
• The Mesosauria are either considered as basal Sauropsida (the most common interpretation) or as Parareptiles (Robert Reisz, pers., commun. to MAK)

[edit] Credits

This page MAK061022