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Re: Ankylosaur tail and pelvis pathologies



The thagomizer strikes back
Jean-Michel

Le 22/05/2011 20:00, bh480@scn.org a écrit :
From: Ben Creisler
bh480@scn.org

I don't recall seeing this new paper mentioned yet on the DML:

Victoria M. Arbour and Philip J. Currie (2011)
Tail and pelvis pathologies of ankylosaurian dinosaurs.
Historical Biology: An International Journal of Paleobiology
(advance online publication)
DOI: 10.1080/08912963.2011.563849
http://www.informaworld.com/smpp/content~db=all~content=a937780186~frm=title
link


Abstract
Ankylosaurid dinosaurs had modified distal caudal vertebrae (the handle)
and large terminal caudal osteoderms (the knob), which together form the
tail club. The tail club may have been used as a weapon. Ankylosaur pelvic
and caudal elements were surveyed for evidence of healing wounds that may
indicate traumatic injury, and which could support clubbing behaviour. No
pathologies were found in the handle vertebrae, but several proximal caudal
vertebrae show evidence of infection in the neural spines and transverse
processes. One tail club knob has a lesion that may represent infection,
and another knob has an unusual, furrowed texture of unknown aetiology. Two
pelves each have large lesions at the junction of the fourth dorsosacral
transverse process and the ilium, also of unknown aetiology. The cause of
some lesions remains unknown and none of the pathologies can be used to
support any hypothesised behaviour. If ankylosaurid tail clubs were used as
weapons, then they were either well adapted for resisting fracture, or
typical injuries were catastrophic and unlikely to heal.


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