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Re: Phylogeny of basal birds 2/3
----- Original Message -----
From: <Aegyptiacus@aol.com>
> how do you get *Ichthyornis* and *Hesperornis* more derived than *Anas*?
They share a reduced acromion, which *Anas* doesn't have.
Remember: this
+--*Anas*
`--+--*Hesperornis*
`--*Ichthyornis*
and this
+--+--*Hesperornis*
| `--*Ichthyornis*
`--*Anas*
is the same. (And if you switch *H.* and *I.* nothing changes either.) A
cladogram is a mobile: you can rotate it around every branch, and nothing
changes.