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Re: Therizinosaur systematics



In a message dated 97-03-10 18:32:18 EST, znc14@ttacs1.ttu.edu (Jonathan R.
Wagner) writes:

<< I am not aware of Segnosauria having been defined, at least not
 phylogenetically. Therizinosauroidea is defined as = { + _Alxasaurus_, +
 _Therizinosauridae_ }, and takes priority over undefined taxa. >>

According to whose rules? Who said "phylogenetic" definitions must take
priority over non-"phylogenetic" definitions regardless of publication date?
When and if "phylogenetic" definitions are accepted and codifed through an
international body granted the appropriate powers, then you >might< have a
case, but until then, it is nothing more than the usual sheer
cladist-arrogance to make that assertion. Meanwhile, for diagnoses of
Segnosauria, see Barsbold & Perle's paper, 1980, also Barsbold's 1983
published dissertation.