To: All Msg #166, Oct0693 03:30PM Subject: Turtle ancestors identified The Sept 24, 1993 i

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From: Kathleen Hunt To: All Msg #166, Oct-06-93 03:30PM Subject: Turtle ancestors identified Organization: University of Washington, Seattle From: jespah@carson.u.washington.edu (Kathleen Hunt) Message-ID: <28vke6$jqt@news.u.washington.edu> Newsgroups: talk.origins The Sept 24, 1993 issue of Science has an article about turtle evolution. Turtles have long been a puzzle in paleontology, because they seemed to appear suddenly in the fossil record, with complete turtle shells even on the first known turtle fossils. This article is a re-analysis of pareiasaurs, large armored herbivorous reptiles from the late Permian. They share 16 derived characters with turtles (13 of which are absent in all other basal amniotes) and appear to be turtles' closest relatives. Pareiasaurs had longitudinal rows of bony plates on the back, flanks, and sometimes the belly. Based on the proposed realignment of pareiasaurs with turtles, it seems likely that these plates are the precursor of the turtle shell. The paper is: Lee, M.S.Y. 1993. The origin of the turtle body plan: bridging a famous morphological gap. Science 261:1716-1720. Kathleen

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