Message 2004-10-0061: Re: Fwd: Re: Panstems

Tue, 14 Sep 2004 06:56:04 -0700 (PDT)

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Date: Tue, 14 Sep 2004 06:56:04 -0700 (PDT)
From: [unknown]
To: Mailing List - PhyloCode <>
Subject: Re: Fwd: Re: Panstems

--- Mike Taylor <> wrote:

> Instead of a clade-naming rule or recommendation, I commend a simpl=
> suggestion that has been made on this list (perhaps by Mike Keesey?=
> don't recall).  When the name of a clade is written or spoken in a =
> that might be ambiguous, it should be disambiguated simply by sayin=
> "crown" or "panstem" first.  Thus we might say that _Confuciusornis=
> is a member of "panstem Aves", but not of "crown Aves".

I suggested identifying the type of the clade using an optional title=
apparently others have as well), but I never suggested that two diffe=
clades could have the same name but different titles. It would have t=
o be
"Panstem Clade _Panaves_" and "Crown Clade _Aves_".

Incidentally, in the mathematical notation I proposed earlier (and am=
on a second revision of), you could easily specify which crown a pans=
corresponded to with a parenthetical comment, e.g., "_Sphenacodontida=
e_ is a
Permian subclade of _Synapsida_ (=3DpanstemClade(_Mammalia_))."

=3D=3D=3D=3D=3D> T. Michael Keesey <>
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