Re: Evolution:Small Scale/Grand Scale

[Bill Adlam <bill.adlam@st-peters.oxford.ac.uk>]

On Mon, 22 May 1995, Skip Dahlgren wrote:

> I don't mean to sound flippant, but how far can you carry such cladistic 
> logic?  In theory, there is only one clade: Protozoa; we're demonstrably all 
> descendants of some Urprotozoan, right?  Obviously, you wouldn't carry the 
> process to such an extent, but where *do* you draw the line?

You can nest clades inside each other, no problem.  And I would carry the 
process to that extent, though I wouldn't try to make a clade out of the 
protozoa (still less fish!).  There are aleady perfectly good terms 
available like eukaryotes and vertebrates, without any need for changing
the meaning of others.
                                                                Bill Adlam