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Re: HYPSILOPHODONT MONOPHYLY
Pete Buchholz wrote:
Also, the authors seem to sink three very distinct species into one in
to Yandusaurus hongheensis, lumping "Yandusaurus" multidens and Agilisaurus
louderbacki all into the same species with Y hongheensis.... In my opinion
it's like sinking Camptosaurus and Parasaurolophus into Iguanodon...
Discussion? Anyone have opinions?
Carpenter (1994) presents a good case for regarding _Yandusaurus multidens_
as a young individual (and therefore a junior synonym) of _Yandusaurus
hongheensis_. Carpenter (1994) sets out the features which distinguish _Y.
multidens_ from _hongheensis_ and, based upon ontogenetic changes observed
in a growth series of _Dryosaurus altus_, claims that all the features that
define _Y. multidens_ as a separate species are in fact hallmarks of an
immature individual. Aside from smaller body size, these features include:
enlarged orbits; shorter muzzle; scapula longer than humerus; absence of a
ridge on the ventral surface of the coracoid; and humerus narrower at the
proximal end and exhibiting less curvature of the shaft (Carpenter, 1994).
As for the headless _Othnielia_... I heard a very sad story about how the
skull of _Othnielia_ was stolen ("head-hunted") before the specimen could be
completely excavated. The specimen was discovered and its location noted,
but when a team returned to begin excavation, the skull had already been
excavated (presumably by private collectors) and has never been seen again.
Is this a true story? If so, it has my blood boiling...
Carpenter, K. (1994). Baby dinosaurs from the Upper Jurassic Morrison
Formation of Dinosaur National Monument. p.288-297. In: Carpenter, K.,
Hirsh, K.E., and Horner, J.R. (Eds.). Dinosaur Eggs and Babies. Cambridge
Univ. Press, U.K.
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