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Date: Mon, 05 Feb 2001 14:45:08 -0600 (CST)
From: "Jonathan R. Wagner" <znc14@TTACS.TTU.EDU>
To: PhyloCode@ouvaxa.cats.ohiou.edu
Subject: Addendum 2: Nominal apomorphy as specifier
All,
In reviewing the literature for an upcoming paper, the issue of the
names of apomorphy-based clades, and the definitions of clades named after
apomorphies came up. Not that I believe there is any need for strict rules
on this subject, but I felt that the following three recommendations might
be appropriate. Note that I have sent them separately, although they should
probably be considered as part of the same discussion.
Jonathan R. Wagner
-------------------------------------------------------
Draft item (Recommendation 11.8D?) for PhyloCode, Article 11
Recommendation 11.8D: It is recommended that, when an apomorphy-based
definition is established for clade name derived from an apomorphy, that
apomorphy should be used as a specifier in the definition of that clade name.
Example 1: The name _Ankylopollexia_ Sereno 1986 refers to the ankylosed
pollex of some ornithischian dinosaurs, and might be defined as "the clade
stemming from the first species in which metacarpal I is fused, through
distal carpal 1, to the radiale, in a conformation that is synapomorphic
with that condition in _Iguanodon bernissartensis_ Boulenger_et_van Beneden
1881."
Example 2: While a dentary/ squamosal jaw joint is traditionally regarded
as a fundamental character of _Mammalia_ (see above), it would seem
inappropriate to use this as a specifier, since the clade name clearly
refers to another character. As above, however, given the affinity of most
authors with this clade, it is unlikely that excessive confusion would result.
--------------------------------------------------------------------------------
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