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Re: Dromaeosaur dorsal attacks led to ceratopsian shields and other dino gear? (free pdf)



This paper would seem to have been released two months too late.

On Tue, Jun 10th, 2014 at 2:47 AM, Ben Creisler <bcreisler@gmail.com> wrote:

> A new paper:
> 
> Garnet Fraser (2014)
> â??Bizarre Structuresâ?? Point to Dromaeosaurs as Parasites and a New
> Theory for the Origin of Avian Flight.
> The Journal of Paleontological Sciences: JPS.C.2014.01
> http://www.aaps-journal.org/pdf/Garnet-Fraser-JPS.C.2014.01.pdf
> 
> Abstract
> 
> Ceratopsian neck frills, lambeosaurine crests, hadrosaur scales,
> stegosaur plates, cranial dome horns of Pachycephalosaurus
> (=Stygimoloch), diplodocid â??whipâ?? tails, sauropod dermal spikes,
> elaborate osteoderms, and elongated neural spines are considered
> bizarre dinosaur structures. Species identification, thermoregulation,
> sexual selection and display functions are theorized to explain these
> structures, not mechanically suitable for defense against large
> theropods. I propose that bizarre structures may have served to defend
> against parasitic dorsal attacks from riding dromaeosaurs. Removal of
> soft tissues by dromaeosaurs may have caused desiccation necrosis,
> callus formation and osteomyelitis, consistent with deformities in
> fossilized bone. Frequent dismounts from large living dinosaurs may
> explain the origin of feathers, gliding and avian flight. Plausibility
> of dorsal dromaeosaur riding is theorized from extant models
> including: the accipitrids (eagles), Geospiza difficilis
> septentrionalis (vampire finch), Gulo gulo (wolverine), Isistius sp.
> (cookie cutter shark), and vampire bat. Geologist Davidson-Arnott
> questions the â??lethal sandslideâ?? burial of the Mongolian â??fighting
> pair,â?? a Velociraptor and Protoceratops, found locked in battle.
> Re-evaluation of their deposition favors a solitary approach to
> feeding in dromaeosaurs.

-- 
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Dann Pigdon
Spatial Data Analyst               Australian Dinosaurs
Melbourne, Australia               http://home.alphalink.com.au/~dannj
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