From: mkelkar2003
Message: 41586
Date: 2005-10-25
>which
> --- In cybalist@yahoogroups.com, Piotr Gasiorowski <gpiotr@...> wrote:
>
> > Perhaps a biological analogy will help: "warm-blooded animals" is a
> > polyphyletic grouping that includes mammals (Mammalia) and birds
> (Aves).
> > Both of the latter seem to be well-defined natural taxa (clades),
> > means, among other things, that each grouping has developed from adescendants of
> > single ancestral species, and that each contains all the
> > such a common ancestor. But there was no "proto-warm-blooded animal"lizards,
> > since the most recent common ancestor of Mammalia and Aves was also
> > ancestral to many other groups (e.g. crocodylians, pterosaurs,
> > snakes -- in fact, all known amniotes with the possible exception ofOne can tell Germanic is going to be problematic by just looking at
> > turtles, according to some phylogenetic analyses). And the common
> > ancestor wasn't even warm-blooded itself: endothermy developed
> > independently in two different lineages of its descendants.
> >
> > Piotr
>
>
> http://en.wikipedia.org/wiki/Polyphyletic
>
> "Scientific classification aims to group species together such that
> every group is descended from a single common ancestor, and the
> elimination of groups that are found to be polyphyletic is therefore a
> common goal, and is often the stimulus for major revisions of the
> classification schemes. A polyphyletic group can be "fixed" either by
> excluding clades or by adding the common ancestor."
>
> Are the Indo-European linguists making any efforts to "fix" their
> trees? For example following studies suggest that one could obtain
> much cleaner trees by eliminating Germanic and moving around the
> position of Albanian.
>
> Fig 4:
> http://www.stat.berkeley.edu/users/evans/659.pdf
>
> pages 31-34
> "The most we can say is that Albanian cannot occupy a position higher
> in the tree than in Fig 8..(p. 37)
> http://www.cs.rice.edu/~nakhleh/CPHL/RWT02.pdf
>
>
> Fig 5, Fig 10
> http://www.cs.rice.edu/~nakhleh/Papers/81.2nakhleh.pdf
>
> Notably, IIr and Anatolian branch do not have any contact edges but
> serveral European branches do.
>
> M. Kelkar