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Re: Screaming dromaeosaur biplane killers of the air




Gregory S. Paul wrote-
As I detail in DA, the Johel dromaeosaurs have a large
set of arm, pectoral girdle, and trunk adaptations for advanced flight not present in Archaeoptryx, which itself
was probably a competent powered flier, not just a
glider. In no regard are the flight adaptations of the dromaeosaurs' forelimbs inferior (read the descriptions of the various Johel coracoids and study the illustrations
carefully).



Do you not mean "Jehol"?


The spherical femoral head of the type Sinornithosaurus
is pictured in the Nature description, my hi-res photos
verify it. Combined with the splayed out hindlegs of
the completely articulated spread eagled sinornithosaur later described in Nature and the presence of well developed leg wings, the burden is upon those who wish to challange
the ability of Johel dormaeosaur legs to sprawl.



When you speak of the "spread eagled sinornithosaur", are you referred to the specimen described in this paper...


Ji, Norell, Gao, Ji, and Ren, (2001). The distribution of integumentary structures in a feathered dinosaur. Nature 410:1084-1088


Biplane, for those having trouble with basic etymology, means two(bi) wings(planes). The arrangment of the wings is not definitive. There are tandem biplanes, staggered biplanes, and so forth.


Is the posture you are describing similar to that of the leaping (?) *Archaeopteryx* musculature illustration on page 213 of Predatory Dinosaurs of the World? If so, then in regards to the biplane comparison, the arm feathers would form the dorsal wing surface, the leg feathers would form the lower wing surface, and the distal tail fan would form, of course, the tail...? Just trying to be absolutely clear on the matter.



Nick Gardner

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