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Re: Emus a Model for Dinosaurs?
Michael Skrepnick wrote-
Lack of a 4th trochanter would seem to be a far more overwhelming obstacle
to performing traditional bipedal theropod locomotion ( where then in fact
is the origin for a caudofemoral retractor in Caudipteryx? ) than the
alternative, a primitive knee driven movement supported by slender femora.
. . essentially, does a missing 4th + "convergent?" knee driven locomotion
trump the lack of a derived ( if even necessary? ) robust femor ?
The absence of a fourth trochanter in itself probably had little effect on
locomotion. Velociraptor's femur has a large fourth trochanter, for
instance, while that of Deinonychus lacks even a discernable scar. Yet the
genera are extremely similar in morphology otherwise, and Deinonychus
certainly lacks neornithine proportions.