By "cladists like Harshman" I mean what I call "cladophiles" --
cladists who will not tolerate paraphyletic taxa in formal
classifications.
"Paraphyletic" is a term for taxa like the traditional Reptilia which
did not include all of its descendants. [The old Reptilia excluded
mammals and birds.] A sizable percentage of taxa used by
paleontologists like Romer, particularly on the level of families and
subfamilies, were paraphyletic.
Here is a reply to part of a post by the ardent cladophile John
Harshman, from the discussion,
Subject: Re: Paraphyletic taxon =? grade? Re: Turtle genome sequence
and analysis
It revolves around a 1981 article by Joel Cracraft:
http://research.amnh.org/vz/ornithology/pdfs/1981e.Pattern%20process%20in%20paleobiology.pdf
On Apr 26, 9:57 pm, John Harshman <
jharsh...@pacbell.net> wrote:
> On 4/26/13 6:42 PM, pnyikos wrote:
> > On Apr 26, 8:58 pm, John Harshman<
jharsh...@pacbell.net> wrote:
> >> On 4/26/13 5:44 PM, pnyikos wrote:
> >>> "Several reasons can be suggested for the adverse reaction of
> >>> paleontologists towards cladistics. One is that cladists occasionally
> >>> have made provocative statements which naturally released negative
> >>> reactions"
>
> >>> Occasionally, my foot! Cracraft seems blissfully unaware of how
> >>> provocative his relentless repetition of the pejorative "unnatural" to
> >>> describe paraphyletic taxa is. [He even uses the word "nonexistent"
> >>> enclosed in scare quotes.]
[snip]
> >> I'm amazed at your ability to beat on Joel Cracraft from 30+ years ago.
>
> > Why aren't you amazed at the ability of atheists and others to beat on
> > the Bible from 20 centuries or more ago?
>
> Joel will be happy to know that you're equating his paper with the
> bible. But I suppose it's that the bible is still actually a current
> issue, while Joel's 1981 paper isn't by any stretch.
Come off it, Harshman! In most of the posts where we debate the topic
of paraphyletic taxa, you might as well be channeling Joel with your
use of pejorative labels like the ones I quote above, and much else.
In fact, if he was the one who originated the use of pejoratives like
them, then he is to cladophilia as Moses is to Judaism. And one could
make a two-book "bible" of cladophilia with some writings of Hennig
being the analogue of Genesis and all but the last section of Joel's
paper being the analogue of Exodus.
I suspect the reason you stress that his paper is 30+ years old is
that the last section, where he finally gets off his anti-paraphyly
hobbyhorse, is an acute embarrassment to neo-Darwinists. For instance:
"The conclusion that evolution by natural
selection produced hypsodont teeth, or that
change in tooth structure through time is
consistent with population genetics, is axiomatic
(Cracraft 1981). Explanations of this kind, which
are common in the paleontological literature, are
structured so that they can account for any
observation. As such they have limited scientific
value, for how are we to say we are wrong in any
specific instance?" [pp. 466-467]
Peter Nyikos
Professor, Dept. of Mathematics -- standard disclaimer--
University of South Carolina
http://www.math.sc.edu/~nyikos/
nyikos @
math.sc.edu