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Re: Unenlagia Pelvis



More back mail.

Rutger Jansma (fam.jansma@worldonline.nl) wrote:

<But still, the retroversion, even if it just some 3 degrees or something
like that, is not seen in any reconstruction of this element, but it is
there in the material.>

  Maybe, if, could be. In either direction.

<Second, who says the ilium was that much higher than that it is
preserved? IMHO the dorsal ilium is complete and remarkebly similair to
that of Archaeopteryx as reconstructed by HP Greg Paul in DA. It might not
be completely complete, the area pointing towards the presacral vertebral
column is broken of and is correctly reconstructed in the same
reconstruction. Another point of difference in the preserved material and
the reconstruction is the area just were above the pubis articulates with
the ilium, in the material it follows a sort of circular shape, while it
is reconstructed as being shaped as a half donut. The ischium is also more
reconstructed than that is necessary, I see no reason for the additional
placement of bone and therefore creating the shape that is commonly seen
in the reconstructions.>

  There is no positive view in my mind on whether the pubis was anything
but vertical, and you must note that the element proserved is not in
complete articulation, was found in about 100 fragments in a semblance of
its normal shape, and margins may be broken or complete, which the authors
approximate. Any other additions are based on the base of margins being
continued to their extent with restoration being marginal That is why
there is no long, immense process but a short, strongly tapered one. Note
the fractured state of the type, the best way to see this is up close and
personal, and the author's should be regarded as something of an authority
on the thing. Barring that, news photos of the pelvis are laid out flat
when the pelvis is naturally comprised of curved and inclined sets of bars
and plates, falsifying images of iliac height and so forth, shape, etc. A
big problem with recent restorations of the ilium of *Avimimus*, for
instance, is a neglect of the fact that it lies medially at about 45
degrees, which may be a condition of crushing as the pubic peduncles are
wider than the pubes naturally articulated account for; but the lateral
view is not of the lateral surface of the ilium, but what it would look
like if seeing the incline from an angle, reducing the aspect of the
thing. This is usually reversed in many other illustrations where an
inclined ilium is shown in vertical lateral view, even if inclined. One
looses detail and idea of shape when one is forced to view from one angle
only. This is the main problem with scapulocoracoid shape articulation,
including ideas of twisting coracoids based on gross shape and not actual
articulation.

  Cheers,

=====
Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

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