• 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.
• Provelosaurus brasilienses - Photograph of the fossil skull of this pareiasaur from the late Permian.
• Subclass Anapsida - Provides information on the two main groups of anapsids, the extinct Captorhinida and the extant Chelonia.

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