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Allan Edels (edels@msn.Com) wrote:

<The first dinosaurs named in the USA were: _Deinodon horridus_,
_Trachodon mirabilis_, _Palaeoscincus costatus_, and _Troodon formosus_.
These were named by Joseph Leidy in 1856.  (They were found by Ferdinand
Von Hayden in what is now Montana, around 1854-1855 - in the Judith River
formation).  Note that all but one of these names are no longer considered
valid.  (The valid one is, of course, _Troodon_).>

  The validity or relative invalidity of some of these names is subjective
considering their relative use recently. As recently as the early third of
the last century, *Trachodon* was a validly accepted and used name, until
it was ignored in favor of, first *Anatosaurus* and then *Edmontosaurus,*
based on the relative difficulty in defining *Trachodon* apart from these.
This fate befell *Deinodon* and *Paleoscincus,* and for the moment, these
names are not considered diagnostically differentiable from coeval
species, or even from older forms. However, it is just as likely that any
of these forms may belong to a known, later-named form OR are valid
alternately, so for the moment, they can be considered valid, but useless
to taxonomy (i.e., naming claudes upon them, referring species to them, or
assigning further material) based on the lack of direct comparison.

Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)

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