[Taxacom] Hennigian Term?

[Frank.Krell at dmns.org]

Right with the misspelling.
However, Hennig defined autapomorphy as derived character state (or trait) of any single taxon, whether species, terminal or anywhere in the tree. I am not sure when it became redefined as derived trait of a terminal taxon. Does anybody know? Or was it just sloppyness or uninformed usage that became a habit?
There is no 'opposite' to autapomorphy. The respective ancestral state would be a plesiomorphy. A synapomorphy is the common derived character state of several taxa (which form a monophyletic group).
In short: Character 1' is a synapomorphy of A, B and C (the components of the monophylum), and an autapomorphy of (A+B+C) (the monophylum itself).
 
Cheers
 
Frank
 

Dr Frank T. Krell 
Curator of Entomology 
Editor, Systematic Entomology 
Commissioner, International Commission on Zoological Nomenclature 
Department of Zoology 
Denver Museum of Nature & Science 
2001 Colorado Boulevard 
Denver, CO 80205-5798 USA 
Frank.Krell at dmns.org 
Phone: (+1) (303) 370-8244 
Fax: (+1) (303) 331-6492 
http://www.dmns.org/main/en/General/Science/ScientificExperts/Biographies/krellFrank.htm <https://mail.dmns.org/exchweb/bin/redir.asp?URL=http://www.dmns.org/main/en/General/Science/ScientificExperts/Biographies/krellFrank.htm> 


________________________________

From: taxacom-bounces at mailman.nhm.ku.edu on behalf of Jody Haynes
Sent: Sat 05/07/2008 14:50
To: Taxacom
Subject: Re: [Taxacom] Hennigian Term?



It is probably a misspelling of "autapomorphy," which is a cladistic term
that refers to a derived trait possessed by a single species (or terminal
group) and none of its genetic relatives (or other members of its clade). It
is the opposite of "synapomorphy".

Jody

----- Original Message -----
From: "Robin Leech" <releech at telusplanet.net>
To: <taxacom at mailman.nhm.ku.edu>
Sent: Saturday, July 05, 2008 12:33 PM
Subject: [Taxacom] Hennigian Term?


> Anyone out there familiar with the term
> "outapomorphy"?
> Robin
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>



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