[Previous by date - Fwd: Re: Panstems]
[Next by date - Fwd: Re: Another Possible Problem with Naming Conventions fo=]
[Previous by subject - Fwd: Re: REPOST: Crowns, Panstems, and their Correspondence to each other]
[Next by subject - Fwd: Re: Rec. 10A and panstem names]
Date: Mon, 13 Sep 2004 08:29:03 -0400
From: [unknown]
To: phylocode@ouvaxa.cats.ohiou.edu
Subject: Fwd: Re: REPOST: Crowns, Panstems, and their Correspondence to each other
> >--- Kevin de Queiroz <Dequeiroz.Kevin@NMNH.SI.EDU> wrote: > > > The approach we have taken is not to have a rule specifying the = meaning of > > "extant" but to have a rule stating that a specified meaning (th= e same one > > that TMK suggested) is to be adopted if the original author did = not specify >> the meaning. This gives the authors of definitions more freedom = but also >> prevents ambiguity. Here is the rule: >> 9.5. If the author of a crown clade definition (Note 9.4.1) did n= ot specify >> the meaning of "extant" or "crown clade" or an analogous term use= d in the >> definition (e.g., "living", "Recent"), then subsequent authors ar= e to >> interpret that definition as referring to organisms or species th= at were >> extant on its publication date (Art. 5). > T. Michael Keesey wrote: >Great idea! >But for stability, mightn't it be good to specify "extant AND=20 >ALREADY PUBLISHED >on its publication date"? > I don't think this addition would be a good idea. If a species were= =20 discovered a few years after an apomorphy-modified node-based=20 definition was published, and the species possessed the apomorphy= =20 used in the definition but its other features suggested that it is= =20 the most basal member of the crown clade, wouldn't we want it to be= =20 included in the clade? It was certainly extant a few years earlier;= =20 it just hadn't been discovered yet. Phil --=20 Philip D. Cantino Professor and Associate Chair Department of Environmental and Plant Biology Ohio University Athens, OH 45701-2979 U.S.A. Phone: (740) 593-1128; 593-1126 Fax: (740) 593-1130 e-mail: cantino@ohio.edu