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Re: Dinosaur a tecnical term; fish is not (was RE: Fish with milk (Sheesh spinoff))
On 27/10/2006, at 1:31 PM, evelyn sobielski wrote:
essentialism. Types were
held to be the exemplars of some taxon (for
instance, there was
commonly a "type species" for genera in the early
19thC), but they
did not have to bear all the characters of the
taxon's other members.
Every Linnean genus still requires a type species -
the one which is first described as member of that
genus or in cases like splits a newly designated one*.
Hence "name-bearing type". If you consider a genus a
clade (which it should ideally be), the type species
is the subclade where whe containing clade of which
bears that name if not a junior synonym. Thus, if the
type species gets removed from a genus, it takes the
genus name along with it. At least that's how it works
in zoology, but I think everywhere else too.
But as I understand it, not being a taxonomist myself, we no longer
require that the type species is the most "typical" of the genus.
That is to say, that the type species has the most general characters
that are the differentiae of the genus.
John S. Wilkins, Postdoctoral Research Fellow, Biohumanities Project
University of Queensland - Blog: evolvethought.blogspot.com
"Darwin's theory has no more to do with philosophy than any other
hypothesis in natural science." Tractatus 4.1122