[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: birds and avians again
George Olshevsky (Dinogeorge@aol.com) wrote:
<Whales look more like fish than they look like horses. Do we then classify
whales within Pisces
instead of Mammalia?>
I can personally tell you that I've never confused a whale with a fish. They
have, on the
outside visually, flubbery flesh, nostrils for breathing air, an extrusionary
organ for copulation
in males [penis], and they suckle their young (I have watched whale calves
suckle). These indicate
an intrinstic mammalian appearance.
By similar token, pterosaurs and birds were once regulated to a single clade
exclusive of other
reptiles (incl. dinosaurs) called Dracones, based solely on their similar
adaptations to flight.
I am curious, however, George, why you use Pisces? By your definitons, it is
polyphyletic, not a
viable stem-clade, as all bony fish (Osteichthes) includes tetrapodomorphans,
and thus, most
un-fish like vertebrates. The most inclusive clade comprising bony fish is
excluding dipnoans and tetrapods (Choanata, I believe). Pisces has not been
used as a formal group
I beleive, for a century or so...
Jaime A. Headden
Where the Wind Comes Sweeping Down the Pampas!!!!
Do You Yahoo!?
Get email alerts & NEW webcam video instant messaging with Yahoo! Messenger