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The Difference Between Therapsida and Theropsida



Ken Kinman wrote:

<In your example, Tyler would be a choanoflagellate
(almost an animal but not quite, as you put it). Marla
would be a primitive sponge.>

  As stated, _Tyler_ is an outgroup to Animalia, and
_Marla_ is itself a basal (-most?) animalian. Assuming
_what_ each is more explicitly is not done, because no
example was made, and this is entirely the point.

  Unless there was an observation of the event from
which one form offsprung another, you cannot assume
the descent of that form. Saying one's a sponge and
the other's a choanpflagellate is suggesting you know
precisely the evolutionary events that entailed the
appearance of these two forms. Simply, you do not.
_Tyler_, evolutionarily, may lie between
choanoflagellates and animals, rather than being one
or another, and the system you put forward would not
demonstrate this.

  Please, and tell me if I'm mischaracterizing your
position, Mr. Kinman, don't confuse cladistics with
those systems which assume reality through
hypothetical phylogenies applied by cladistics
(strictists) ... there is a difference.

=====
Jaime "James" A. Headden

  Dinosaurs are horrible, terrible creatures! Even the
  fluffy ones, the snuggle-up-at-night-with ones. You think
  they're fun and sweet, but watch out for that stray tail
  spike! Down, gaston, down, boy! No, not on top of Momma!

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