BIOL-3030 Lecture Notes - Lecture 16: Cryptodira, Skull, Shoulder Girdle
Document Summary
Lecture 16 - reptile diversity (part 1) - mostly turtles. A: turtles are anapsids and sister group to all other reptiles. Older (historical) classification, based on lack of temporal fenestrae. Now widely accepted that turtles are part of diapsid clade, just with highly modified skills that lost temporal fenestrae (molecular/developmental evidence) This may be part of lepidosaurs (b) or. What you see on the outside of turtles can"t tell you where they fall in the cladogram. There has been more recent findings suggesting other ideas. Extensive fossil record (back to the triassic period about 2million years ago. Basic turtle body design (shell, etc. ) very early. Has very long tailmost modern turtles have short tail. There is no way for this animal to retract its head into shell modern turtles do. Some species that areterrestrial, freshwater(most time on land), marine. Two major clades based on mode of neck retraction. Some extant cryptodires have lost ability to retract head.
