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Re: Edmontosaurus (male?) had fleshy cock's comb crest (free pdf)



It says I need a subscription to see it. MY HEAD IS
EXPLODING!!!!!!!!!!!!!!!!!!!

-- Donna Braginetz



On Thu, 12 Dec 2013 09:13:40 -0800, Ben Creisler <bcreisler@gmail.com>
wrote:
> From: Ben Creisler
> bcreisler@gmail.com
> 
> A new online paper with free pdf:
> 
> 
> Phil R. Bell, Federico Fanti, Philip J. Currie & Victoria M. Arbour
(2013)
> A Mummified Duck-Billed Dinosaur with a Soft-Tissue Cock’s Comb.
> Current Biology (advance online publication)
> doi: 10.1016/j.cub.2013.11.008
> http://www.cell.com/current-biology/abstract/S0960-9822(13)01394-8
> Click on "pdf" to open and save.
> 
> 
> Among living vertebrates, soft tissues are responsible for labile
> appendages (combs, wattles, proboscides) that are critical for
> activities ranging from locomotion to sexual display. However, soft
> tissues rarely fossilize, and such soft-tissue appendages are unknown
> for many extinct taxa, including dinosaurs. Here we report a
> remarkable “mummified” specimen of the hadrosaurid dinosaur
> Edmontosaurus regalis from the latest Cretaceous Wapiti Formation,
> Alberta, Canada, that preserves a three-dimensional cranial crest (or
> “comb”) composed entirely of soft tissue. Previously, crest function
> has centered on the hypertrophied nasal passages of lambeosaurine
> hadrosaurids, which acted as resonance chambers during vocalization.
> The fleshy comb in Edmontosaurus necessitates an alternative
> explanation most likely related to either social signaling or sexual
> selection [ 5, 6 and 7]. This discovery provides the first view of
> bizarre, soft-tissue signaling structures in a dinosaur and provides
> additional evidence for social behavior. Crest evolution within
> Hadrosaurinae apparently culminated in the secondary loss of the bony
> crest at the terminal Cretaceous; however, the new specimen indicates
> that cranial ornamentation was in fact not lost but substituted in
> Edmontosaurus by a fleshy display structure. It also implies that
> visual display played a key role in the evolution of hadrosaurine
> crests and raises the possibility of similar soft-tissue structures
> among other dinosaurs.
> 
> 
> HIGHLIGHTS
> 
> A soft-tissue cranial crest is described for the hadrosaurid
> Edmontosaurus regalis.
> 
> The crest, analogous to a cock’s comb, was likely a sexual display
> structure.
> 
> Fleshy combs replaced bony crests in some hadrosaurids at the end of
> the Cretaceous.