[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: BIRD CHARACTERISITICS
Sorry to repeat myself, but when I got my post I realized I'd made some
I forgot to mention the fused "wrist" and partially fused metacarpals.
The "keel" on the sternum is called a carina, the wishbone is the
Archeopteryx does have a furcula in addition to the feathers (as do many
I read in an encyclopedia that Archeopteryx *may* have had a slightly
keeled sternum, but that is the only reference I have to it.
On Tue, 21 Oct 1997 13:11:52 -0700 firstname.lastname@example.org writes:
>I'm not sure what the diagnostic features would be, but to make sure
>everyone knows what we are talking about I will list the unique
>features of birds. Some of these features are shared by other animals,
>but they are distinctly avian characteristics.
>1) large sternum with a deep furcula (keel) attached to long ribs and
>elongated coracoid bones.
>2) shoulder girdle rotated and shifted upward, even with the backbone.
>3) elongated lower leg bones and a modified ankle (tarso-metatarsus)
>4) elongated ilium attached to at least 11 vertebrae and as many as
>5) ischium and pubis point backward to make room for the sternum.
>6) short body centered over the feet with breastbone between the
>7) shortened pygostyle tail.
>8) merged temporal openings.
>Archeopteryx has only the last feature. One should expect to find the
>others to some extent (or at least the beginings of them) in ancestral
>On Tue, 21 Oct 1997 11:58:23 -0600 (MDT) Jeffrey Martz
>> To expand a little, what are the diagnostic charcteristics of
>>Again, alternatives not based on the _Archaeopteryx_ &/or theropod
>>ancestry theory would also be nice.