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Re: Adios, "Brachiosaurus" brancai

Tim Williams schrieb:
I do think Mike makes a good case for making the east African _brancai_ a separate genus from the North American _altithorax_. Apart from the reasons stated in Taylor (2009), this also dispels the much vaunted faunal association between the Tendaguru and Morrison Formations. For a long time, these two formations were thought to share a common fauna, which (in turn) was cited in support of a privileged connection between east Africa and western North America during the later Jurassic. With other "common" Tendaguru-Morrison genera likewise split up (_Barosaurus_/_Tornieria_, _Dryosaurus_/_Dysalotosaurus_), it was only a matter of time before _Brachiosaurus_ went the same way.
yeah, there is a distinct difference between the two, just think of Kentrosaurus and Stegosaurus.

However, I certainly don't agree that all genera should be monospecific.  Using 
that logic, _Psittacosaurus_ would have to be split up into six or seven (or 
whatever) genera, which does not seem justified.
and if we were talking ungulates, then there WOULD be 7 different genera.

same yardstick for all, I'd say, and if so, then splitting is better than lumping.


Dr. Heinrich Mallison
Museum für Naturkunde - Leibniz-Institut für Evolutions- und
Biodiversitätsforschung an der Humboldt-Universität zu Berlin
Invalidenstrasse 43
10115 Berlin

Tel: +49(0)30-2093-8764
Email: heinrich.mallison@mfn-berlin.de