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Date: Mon, 05 Feb 2001 14:51:24 -0600 (CST)
From: "Jonathan R. Wagner" <znc14@TTACS.TTU.EDU>
To: PhyloCode@ouvaxa.cats.ohiou.edu
Subject: Re: Addendum 3: Specifiers for non-apomorphy-based apomorphy-derived clade names
At 02:45 PM 2/5/01 -0600, I wrote:
> Example: Sereno (1999) defined _Ankylopollexia_ Sereno 1986 using a
>node-based definition specified internally by _Camptosaurus dispar_ (Marsh
>1879) and Parasaurolophus walkeri Parks 1922. However, the latter taxon does
>not even possess a pollex, indeed, no hadrosaurid does. Definition of this
>clade name as "the least inclusive clade containing _Camptosaurus dispar_
>(Marsh 1879) and _Iguanodon bernissartensis_ Boulenger_et_van Beneden 1881
>would, under most phylogenetic hypotheses, encompass the same group.
>However, should these taxa be found to form an exclusive group united by
>their common thumb, other taxa without the ankylopollexian condition would
>not be retained in the group.
Correction of typos (they never stop...):
Example: Sereno (1999) defined _Ankylopollexia_ Sereno 1986 using a
node-based definition specified internally by _Camptosaurus dispar_ (Marsh
1879) and _Parasaurolophus walkeri_ Parks 1922. However, the latter taxon does
not even possess a pollex, indeed, no hadrosaurid does. Definition of this
clade name as "the least inclusive clade containing _Camptosaurus dispar_
(Marsh 1879) and _Iguanodon bernissartensis_ Boulenger_et_van Beneden 1881,"
would, under most phylogenetic hypotheses, encompass the same group.
However, should these taxa be found to form an exclusive group united by
their common thumb, other taxa without the ankylopollexian condition would
not be retained in the group.
--------------------------------------------------------------------------------
Jonathan R. Wagner, Dept. of Geosciences, TTU, Lubbock, TX 79409-1053
"Why do I sense we've picked up another pathetic lifeform?" - Obi-Wan Kenobi