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Silesaurus and Trialestes
Something that occurred to me recently... it would be interesting to compare
the recently described _Silesaurus opolensis_ with _Trialestes romeri_,
which was recently touted as a possible early dinosaur (Clark, Sues and
Berman, 2000). In both taxa, the forearm is very long, and exceeds the
length of the humerus. Both _Silesaurus_ and _Trialestes_ also come from
around the same ag (late Carnian) (Dzik, 2003), not that that means very
much by itself. _Silesaurus_ has a closed acetabulum, whereas that of
_Trialestes_ is perforate; but this character is very labile in early
Dinosauria/Dinosauriformes (e.g., _Guaibasaurus_ and _Saturnalia_ both have
a closed acetabulum).
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