[Taxacom] Reptilia (and Hominidae)
jcclark-lists at earthlink.net
Tue Mar 17 22:35:40 CDT 2009
On 2009-03-17 11:51, Richard Zander wrote:
> Rank counts. There are only two ways to signal information in
> classifications, and those are rank and groupings. Enforcing monophyly
> limits rank as an informational metric.
Allowing paraphyly limits grouping as an informational metric.
A classification that includes all the saurischians in Aves and the rest
of the dinosaurs in Reptilia precludes the acceptance of a
classification that includes only the velociraptor-warbler clade in Aves
and the rest of the saurischia in Reptilia. As I put it to Ken once,
paraphyletic groups don't play well with others.
Curtis Clark http://www.csupomona.edu/~jcclark/
Director, I&IT Web Development +1 909 979 6371
University Web Coordinator, Cal Poly Pomona
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