[CPN] Proposal to reorganize really just Note 9.3.1 this time
Michel Laurin
michel.laurin at upmc.fr
Wed May 1 20:20:20 EDT 2013
Hi all,
It is late, but I will be busy with something else tomorrow
(technically, later today because it is 2:20AM), so I just want to add
that after reading Kevin's and David's comments, with which I agree (at
least at first glance), if the changes outlined by both are done, I
think that I will feel comfortable voting for the amendment.
Good night,
Michel
On 02/05/13 02:10, David Marjanovic wrote:
> The entire text of the version I propose follows. Because it is so
> different from the current wording, I have not marked additions and
> deletions, except where I propose to delete entire paragraphs.
>
> =================================
>
> /Note 9.3.1./ The definition of "clade" is "an ancestor (an organism,
> population, or species) and all of its descendants" (Art. 2.1).
> Building on this definition, clade names can be defined by pointing at
> such an ancestor, creating a phylogenetic definition. This can be done
> in different ways, such as the following:
>
> * The ancestor can be mentioned directly in an ancestor-based
> definition: "A and all its descendants", where A is a specific
> organism, population, or species.
> * Usually, however, the intended ancestor is not directly known.
> Thus, the ancestor can be indicated by its relation to two or more
> specifiers (Art. 11) that are mentioned directly:
> o A minimum-clade definition [note the hyphen which makes clear
> that the clade, not the definition, is a minimum] may take the
> form [...]
> o A maximum-clade definition may take the form [...]
> o An apomorphy-based definition may take the form [...]
> * The ancestor can be indicated by its relation to two or more
> specifiers that are not mentioned directly, but described as
> members of another clade that fulfill certain criteria. Such
> definitions may first describe an unnamed clade and then use its
> extant members (or those fulfilling another criterion) as
> specifiers for a minimum-clade definition:
> o A maximum-modified crown clade definition [note the addition
> of "-modified" to avoid confusion because crown clades are
> minimum clades] may take the form [...]
> o An apomorphy-modified crown clade definition may take the form
> [...]
> * A crown clade in its entirety, mentioned by name, can be the
> internal specifier in the definition of the name of a total clade
> under the conditions specified in Art. 10.5. [This fact
> contradicts a claim in Note 11.1.2.]
>
> [deletion of the two paragraphs that follow this list in the proposal
> we're currently discussing]
>
> The above list is not exhaustive. Most importantly, definitions may
> contain qualifying clauses that restrict their applications to
> specific phylogenetic hypotheses (Art. 11.9).
>
> The system of abbreviations used here [...]
>
> For abbreviations involving qualifying clauses, see Note 11.9.1.
>
>
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--
Michel Laurin
UMR 7207
Muséum National d'Histoire Naturelle
Batiment de Géologie
Case postale 48
43 rue Buffon
F-75231 Paris cedex 05
FRANCE
http://www2.mnhn.fr/hdt203/info/laurin.php
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