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Re: Birds, no mosasaurs [VERY long & theoretical]

>In a message dated 98-02-25 00:20:26 EST, th81@umail.umd.edu writes:
><< And the fact that an "A" can only change to a "T", "C", or "G": other
> options being unavailable in Terran life. >>
>Most morphological characters are not even four-state but only two-state
>(e.g., present-absent, wider-narrower, touching-not touching, etc.). This
>makes long branch convergence >more< likely in morphological analysis than in
>molecular analysis.

In whose analysis?  Try talking to an entomologist or botanist sometime -
I've seen characters in their analyses with up to 15 states.


Christopher Brochu, Ph.D.

Postdoctoral Research Scientist
Department of Geology
Field Museum of Natural History
Lake Shore Drive at Roosevelt Road
Chicago, IL  60605  USA

phone:  312-922-9410, ext. 469
fax:  312-922-9566