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><< Chirostenotes elegans (= Caenagnathus sternbergi)
> Elmisaurus elegans >>
>I think these two species are the same, both being renamings of
>elegans. The oldest available species name for this taxon would be
>Chirostenotes pergracilis, of which all the described American caenagnathid
>species are synonyms. Differences are considered to be due to individual
>variation and sexual dimorphism. (E.g., Caenagnathus collinsi is one sex,
>C.sternbergi the other.)
Not necessarily. There's quite a lot of caenagnathid/elmisaurid material
from North America, most of it from the Judith River Group (and stored at
the Royal Tyrrell Museum). Apart from the holotypes of _Caenagnathus
sternbergi_ and _C. collinsi_, a number of caenagnathid dentaries have been
found which vary in overall size and in the length and depth of the
symphysis. There may be more than one _Caenagnathus_ species represented in
the Judith River Group.
_Chirostenotes pergracilis_ and _Ch. elegans_ may be different species, even
different genera. _Ch. elegans_ has been referred to _Elmisaurus_ by some
researchers based upon the form of the tarsometatarsus.
There's also a new, larger genus of caenagnathid (not yet described) based
upon cranial material found in the Hell Creek Formation of South Dakota.