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Re: dino quadrates



>No theropod has a double headed quadrate. The complete London Arcaheopteryx
>quadrate is also single headed.

Whilst the London specimen appears to have a single headed quadrate, there
is still debate as to wether the bone in question *is* the quadrate. The
bone is the right size and shape, but is disarticulated from the skull. If
there has been general agreement that this bone is indeed the quadrate, I
would like to hear about it (it would make life a lot easier if Archae
*had* a single headed quadrate).

However, Haubitz et al. (1988) (including Ostrom) described (albeit
tentatively) a double headed quadrate from the Eichstatt specimen using
computer tomography. If there has been recent movement on this issue I
would be glad to receive any info on it.

Chris

Haubitz, B. Prokop, M.; Dohring, W.; Ostrom, J.H. & Wellnhofer, P. (1988)
Computed tomography of _Archaeopteryx_. Paleobiology, 14: 206-231.

cnedin@geology.adelaide.edu.au                  nedin@ediacara.org
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Many say it was a mistake to come down from the trees, some say
the move out of the oceans was a bad idea. Me, I say the stiffening
of the notochord in the Cambrian was where it all went wrong,
it was all downhill from there.