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RE: Tyrannosaur stuff




T. Michael Keesey wrote:

I'm not sure where the cut-off between "small-bodied" and "big-ass" is,

:-) Let's go for an arbitrary cut-off of 4-5m. Above that is 'big-ass".

but _Alectrosaurus olseni_, _Alioramus remotus_, and _Dryptosaurus aquilunguis_ were smaller than any tyrannosaurines,

There is a school of thought that _Alioramus remotus_ is based on an immature specimen, and so some of its 'autapomorphies' may be related to ontogeny. It could be a bona fide tyrannosaurine. _Dryptosaurus aquilunguis_ is estimated to be have been a little over 6m long, based on the type material (which appears to come from an adult individual). (The type material for _Appalachiosaurus_ indicates an animal around the same size as the _Dryptosaurus_ type specimen, but the former was immature when it died.) I'm not sure about the maxium dimensions of _Alectrosaurus olseni_, given that the hypodigm for this species requires revision. In any case, all these guys were much larger than _Dilong_ (1.6m; type) and _Aviatyrannis_ (ilium only 90mm long) and significantly larger than _Stokesosaurus_ and _Tanycolagreus_ (both maybe 4m in body length). _Eotyrannus_, with an estimated body length of 4-5m, falls in the middle of the "small-bodied" and "big-ass" categories. :-)


and not terribly larger than EK tyrannosauroids.

Some of the less well known theropod taxa from the EK may turn out to be tyrannosauroids - like the rather large (but perhaps not "big-ass") _"Chilantaisaurus" maortuensis_.


Cheers

Tim