Anapsid - Information from Wikipedia on this class of reptiles which includes the tortoises, turtles and terrapins.
Fossil Groups: Anapsida - Provides information on this group of amniotes, their characters and anatomy, major subgroups, fossil record, modern forms, literature and weblinks.
Introduction to Anapsida - Information on this clade which includes turtles and all their extinct relatives, their fossil record, life history, ecology, systematics and morphology.
Palaeos Vertebrates: Anapsida - Provides an abbreviated cladogram, information on the appearance of the anapsids in the Permian and their subsequent history, with descriptions and information on a number of groups.
Pareiasaur - Provides an illustration and information on these extinct reptiles which are thought to be ancestors of, or close relatives to, the turtles.
