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Re: Concavenator corcovatus, a new humped carcharodontosaurid from Las Hoyas
> and a series of small bumps on the ulna. We think that these bumps
are homologous to quill knobs present on some modern birds; the knobs
are related to the insertion area of follicular ligaments that anchor
the roots of the flight feathers (remiges) to the arm. We propose
that *Concavenator* has integumentary follicular structures inserted
on the ulna, as in modern birds. Because scales do not have
follicles, we consider the structures anchored to the *Concavenator*
arms to be non-scale skin appendages homologous to the feathers of
modern birds. If this is true, then the phylogenetic bracket for the
presence of non-scale skin structures homologous to feathers in
theropod dinosaurs would be extended to the Neotetanurae, enlarging
the scope for explaining the origin of feathers in theropods.
Leaves me speechless with excitement!!!