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Re: Allosaur skin




I wrote:
Quoting the abstract:
"The left side of the body preserves a 30 cm squared skin impression
consisting of small scales 2-3 mm in diameter.  This suggests that
juvenile
allosaurs possessed scaly integument.  This represents the most derived
tetanuran to retain this character, otherwise present in more basal
theropods such as _Carnotaurus_."

"fam jansma" <fam.jansma@tiscali.nl> responded:
Strange to find that a relatively basal one like Sinosauropteryx does have
feathers, perhaps it is size related after all and we all should start
drawing our tyrannosaurs scaly.

See http://www.dinosaur.net.cn/dino00174.jpg and http://www.dinosaur.net.cn/dino00146.jpg and http://www.dinosaur.net.cn/dino00149.jpg. _Sinosauropteryx_, being a basal coelurosaur, is more closely related to birds than _Allosaurus_ is, because _Allosaurus_ is a neotetanuran but not a coelurosaur. It may be that feathers are a synapomorphy of the clade Coelurosauria, in which case only coelurosaurs would possess this feature.


--------
"Dino Guy" Ralph W. Miller III
Docent at the California Academy of Sciences
proud member of the Society of Vertebrate Paleontology