[Taxacom] New systematics book
Richard.Zander at mobot.org
Mon Sep 16 16:04:24 CDT 2013
Extinction is a prerequisite for one kind of speciation, pseudoextinction a la Hennig, with one daughter species and the ancestor going anagenetically extinct by changing into another species. Another kind of speciation is peripatric speciation, with generation of a daughter species and the ancestral species remaining in stasis.
Odd saying that anything should "precluse paraphyletic taxa" when paraphyletic taxa direction imply macroevolution, which is what we've been talking about.
Richard H. Zander
Missouri Botanical Garden
PO Box 299
St. Louis, MO 63166 U.S.A.
richard.zander at mobot.org
From: Cristian Ruiz Altaba [mailto:cruizaltaba at dgcc.caib.es]
Sent: Wed 9/11/2013 3:16 PM
To: Ken Kinman
Cc: JF Mate; Richard Zander; taxacom at mailman.nhm.ku.edu
Subject: Re: [Taxacom] New systematics book
I almost agree. Extinction is a pre-requisite for speciation, but this does not preclude paraphyletic taxa. A classification that includes fossils can, and probably should accept non-monophyly because of this "species germinalis" problem. We know Homo habilis belongs into Homo because we have the privilege of the retrospective vision, which is exactly what makes us consider fossils.
-----taxacom-bounces at mailman.nhm.ku.edu escribió: -----
Para: Richard Zander <richard.zander at mobot.org>, JF Mate <aphodiinaemate at gmail.com>, "taxacom at mailman.nhm.ku.edu" <taxacom at mailman.nhm.ku.edu>
De: Ken Kinman
Enviado por: taxacom-bounces at mailman.nhm.ku.edu
Fecha: 11/09/2013 19:46
Asunto: Re: [Taxacom] New systematics book
> Say, if extinction is a part of speciation, then taxa are temporally isolated. That is, every age has its own set of taxa, some the same as other ages, some diffeent, some shifted or shifting their adaptive regimes or stochastic trait allotments.
Agreed. By the way, if I could have lived in the Jurassic, I would have probably classified birds as just a peculiar family of dinosaurs in Class Reptilia. In the Cretaceous, I would have probably classified birds as a peculiar, but major, Order of Class Reptilia. However, the end-Cretaceous extinction killed off all the dinosaur intermediates, birds radiated enormously, so a present-day classification justifiably recognizes them as a distinct Class Aves.
And when the very first eukaryotes arose, I would have probably classified them as a very peculiar family of bacteria or archaebacteria (certainly not an Empire or Superkingdom). Who would have thought such weird organisms would radiate into all the protists, higher plants, and higher animals (an extinction event at that time might have meant that they never did). Yes, every age does have its own set of taxa, but only a very select few radiate (in form, life style, and/or in numbers) to produce higher taxa in later ages.
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