[Taxacom] Hexapoda origins (and holophyly?)

[Ken Kinman]

Dear All,

      Some of you may recall that in a posting on Taxacom two or three years 
ago, I suggested that Collembola (and thus perhaps other hexapods) evolved 
from ostracods.  I just ran across an abstract by William Newman suggesting 
the same thing:

http://cat.inist.fr/?aModele=afficheN&cpsidt=17186620

     Yet, I am still uncertain that Collembola clade with other hexapods, or 
even if any of the entognaths clade with the Ectognatha.  The following 
paper argues that they do all clade together in a holophyletic Hexapoda, but 
I am still hesitant even though I recognized a holophyletic Hexapoda back in 
my 1994 classification.   What is even more interesting about the following 
paper is that Protura and Diplura may form a clade which they call 
Nonoculata.  If so, it provides further proof that Protura + Collembola do 
NOT form an exclusive clade called Ellipura.  So I guess Nonoculata + 
Ectognatha could clade together, while Collembola could have evolved 
hexapody convergently.  So the hexapod debate continues with yet another 
"twist".  Anyway, here's a link to that paper:

http://mbe.oxfordjournals.org/cgi/content/full/22/7/1579

   ------Cheers,
             Ken Kinman

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