The Anapsida clade includes contemporary turtles and all their extinct relatives, so as to millerettidae, procolophonoidae, pareiasauridae, and other taxa of lesser-known relationships such as Acleistorhinus, lanthanosuchidae and nyctiphruretianiade.
His skull has no openings in the temporal region. Today only survive the current turtles, which have fossils that date back to the Triassic, but an even more ancient origin for this group theorizes. Traditionally it has been included in this taxon to all current and extinct reptiles that lack fenestrations, although today the origin and consistency of this group is discussed and it is possible that different lineages of reptiles alcanzasen the Anapsida condition independently. In fact some scientists hold the theory that the turtles or turtle current diapsid desdienden of reptiles and later lost these openings cranial features.
The currently recognized as belonging to Anapsida orders are:
- Testudines or turtles
- Captorhinidae (extinct)
- Mesosauria (extinct)
- Procolophonomorpha (extinct)
The following illustration shows some anapsids known for its fossils and now extinct:
- Procolophon: Anapsid that lasted until Triassic extinction, probably burrowing habits
- Millereta: A small Permian anapsid externally very similar to current lizards
- Archelon: A giant prehistoric turtle
- Eudibamus: A late Permian eosuchia
- Scutosaurus: Robusto y acorazado pareiasaurido del Pérmico tardío
- Mesosaurus: An anapsid, amphibious life probably
- Hylonomus: Primitive animal from Carboniferous period