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Theropod taxonomy seems to be the flavour of the month, so I'd like
to clarify a few things that have been bugging me.
Firstly, are caenagnathids the same as elmisaurids? In other words,
do the mandibles named _Caenagnathus_ belong to the same group of
theropods as the postcranial bones assigned to the Elmisauridae?
(I believe H.-D. Sues has a _Chirostenotes_ partial skeleton
including a braincase that may resolve this - anybody else heard about
Secondly, is _Erectopus_ an abelisaurid, or a relative of
Thirdly, what is _Koparion_?