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I just started reading David Dilkes 1998 analysis of basal
archosauromorphs (in his _Mesosuchus browni_ paper).
He does not even put choristoderes in Sauria (much less
Archosauromorpha). Two characters which he uses to exclude choristoderes
from Sauria are (1) the primitive lack of crista prootica, and (2) the
"shape of the ectopterygoid along suture with pterygoid" being tranversely
broad (also a primitive state).
(1) Are either of these characters strong enough to exclude
choristoderes from the Sauria? Are crista prootica ever lost secondarily
(2) Can anyone tell me if these character states are primitive
(non-Saurian) in turtles?
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