[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: feathers, hair and Compsognathus
From: Jeffrey Martz <martz@holly.ColoState.EDU>
> Not being up on my basal reptile phylogeny, could someone explain
> to me exactly why reptiles are now considered to be a paraphyletic
> group? I assume this means that thier earliest common ancestor was NOT
> something that shared the traits that has caused scientists to group
> "reptiles" together.
Nope. That would make them *poly*phyletic.
They are paraphyletic because the common ancestor off all things
considered reptiles is also an ancestor of things NOT considered
reptiles, namely birds and mammals. That is, reptiles, as a group,
do not include ALL descendents of their common ancstor.
The peace of God be with you.