Re: Panderichthyids and trans...
GRMorton@aol.com
Tue, 20 Jun 1995 22:22:51 -0400Ashby Camp wrote:
> Turning to the question of whether a crossopterygian possess-
ing a nasal passage, a lung, and infolded enamel on its teeth
qualifies as a transitional form, one needs to know the ancestor
and descendant it is alleged to connect. By labeling these fish
transitional, one implies that they descended from a fish (or some
other creature) that lacked a nasal passage, a lung, and labyrin-
thodont infolding of dentine. There is, however, no indication of
such an ancestry for crossopterygians in the fossil record. <
I disagree that I need to know the ancestor of the crossopterygian.
There are more than one species involved in all this so all I need is
an ancestor species a set of transitional species and then the
daughter species. I do not need to know the origin of the
crossopterygian class to talk about transitions.
I will respond to the other issues when I get a couple of articles
from the library. But once again, thanks Ashby for the
excellent response.
glenn