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Re: Deinocheirus (was Sauropodz r kewl WAS: silly conversation on 2012 US presidential race)
On Mon, Apr 23, 2012 at 1:36 PM, Demetrios Vital
I'm without references at the moment, but Beipiaosaurus has secondaries
that appear to be just rachis, no?
Not quite. It has elongate, broad, filamentous feathers (EBFFs) on the
neck, back and tail. These are in some ways similar to a barb-free
rachis but are broad and flat, as the name suggests, not round and
quill-like (though they are somewhat stiffened relative to the
plumulaceous feathers elsewhere on the body). None are reported from
the arm, as far as I know (the secondaries are reported to be
It's possible that these are Stage 1 protofeathers, or that they're
modified pennaceous feathers where the barbs fused together or have
highly elongate calamus as in the rectrices of confuciusornithids.