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Re: Emus a Model for Dinosaurs?



. . .  amendment. . .

. . .fourth trochanter ( a necessary attachment for caudofemoralis / hindlimb retraction
in MOST acetabulum driven locomotion in theropods ). . .

. . .Lack of a 4th trochanter OR SIMILARLY LOCATED POINT OF ATTACHMENT for m.CAUDOFEMORALIS
would seem to be a far more overwhelming obstacle to performing traditional bipedal theropod locomotion. . .

. . . ( where then in fact is the INSERTION for a
caudofemoral retractor in Caudipteryx? IF NOT OCCUPYING A POSITION SIMILAR TO THAT IN MOST THEROPODS, HAS IT MIGRATED PROXIMALLY TO THAT FOUND IN BIRDS THAT STILL RETAIN THE MUSCLE, RESULTING IN A REDUCED ARC OF MOVEMENT AND SUBSEQUENT RELIANCE ON KNEE MOTION AS IN BIRDS. . .


. . . essentially does a missing 4th trochanter ( OR EQUIVALENT FEMORAL m.CF POINT OF INSERTION ) + POTENTIAL "CONVERGENT" KNEE DRIVEN LOCOMOTION IN CAUDIPTERYX TRUMP THE OPPOSING VIEW ADDRESSING THE LACK OF A DERIVED ROBUST FEMOR ( AS IN MODERN BIRDS ). . . AND IS THIS NECESSARY IN A FORM THAT MAY HAVE REVERTED FROM A "FAILED" EVOLUTIONARY ATTEMPT AT A FLIGHTED CONDITION, BUT STILL RETAINED A BIRD LIKE HINDLIMB LOCOMOTION, A RESULT OF AN ABBREVIATED TAIL AND A SHIFTED CENTER OF GRAVITY / MASS



hope this makes a little more sense. . . been a long day.

Mike S.