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An Albertosaur Apart

I feel the need to pester you all about this merely because I am looking for data that I do not currently have and tyrannosaurids are my current focus.


Does anyone feel that the specimens do constitute a separate species APART from the 'albertosaur'-grade taxa currently given specific names, i.e. _Gorgosaurus libratus_ and _Albertosaurus sarcophagus_. Also, does anyone still consider _G. sternbergi_ to be a separate species? And does anyone consider that _A. arctunguis_ is valid and referrable to _Gorgosaurus_, as discussed briefly (with no real data mentioned) in the page mentioned above? Final bothersome question is this, are the albertosaurs a grade or clade?

Nick Gardner

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