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Date: Fri, 09 Feb 2001 20:49:36 -0800
From: mlee@zoology.uq.edu.au (Michael S. Y. Lee)
To: PhyloCode@ouvaxa.cats.ohiou.edu
Subject: concerns
John wrote: >I hate to be a pessimist, but I observe very little to no discussion of the >groups for which no to few phylogenies are available. How will the Pcode be >applied to the many groups of organisms which are not represented by >phylogenies? Insects come to mind. Many tropical plants at the subfamilial >level come to mind. I hear plenty of arguments for application of the Pcode >with regard to vertebrates and perhaps even higher levels in the plant >world, but how in the hell can we expect to apply a Pcode classification and >nomenclature to understudied and very diverse groups? What do we have to >start with but the current system of classification and nomenclature? In my >opinion and the opinion of a growing number of folks, I think the answer is: >NOTHING but the current systems. >Don't we have a great deal of basic biodiversity survey work to do before we >can just drop the current system and convert to a new system? Since, for once, a message arrives while I'm in the office, I think I should respond... Species: While poorly known groups might pose a problem for PhyloCode, if you stop and think about it, they pose an even greater problem for current codes. For instance, under the current codes, one can't name a species unless one already knows its relationships, since one must assign it to a genus (which is usually now construed to be a small clade of species). However, under PhyloCode, the name of a species (e.g. a uninomial) is uncoupled from information about its relationships - so one can name a species even if one has no idea of its precise affinities. Note, however, that phylocode has some potential mechanisms (e.g. clade addresses) to convey informatin about a species relationships, that are NOT part of its official name. Higher Taxa: I don't think it is true that current codes can name higher taxa accurately in the absence of information of phylogenetic relationships. If people agree that 'Linnaean" higher taxa such as families, genera, etc., must be monophyletic, then one still needs information about phylogenetic relationships to accurately assign species to higher taxa (Linnaean or otherwise). For instance, putting a group of beetle species in the same "family" would require some evidence that they are all more closely related to each other than to beetles in other "families" - if such evidence is available, one should be able to erect a proper node, stem, or apomorphy based definition for that clade. Of course, the current system doesn't explicitly state that higher taxa must be monophyletic, so one can avoid the need for phylogenetic knowledge by arbitrarily erecting higher taxa using vague notions of similarity instead of monophyly, but few scientists would advocate such sloppy stop-gap measures. Finally, while the taxonomic imperative (as the current lack of knowledge of biodiversity is called) is intimidating, I and many others are optimistic of rapid improvement; just look at the results they are getting with deep green (plants)... Regards, Mike ............................................................. Dr. Michael Lee Department of Zoology and Entomology The University of Queensland Brisbane QLD 4072 Australia Ph. 61-7-3365-8817 (Direct Line) 61-7-3365-2491 (Dept. Office) 61-7-3392-4519 (Home - but it better be important) Fax 61-7-3365-1655 Email mlee@zoology.uq.edu.au