Re: Evolution = gradual

Op 22-01-2008 16:29, in artikel 47960BE1.AE268971@xxxxxxxxxxxxxxx, Rich
Travsky <traRvEsky@xxxxxxxxxxxxxxx> schreef:



Yes, of course, see A.Filler 2007 PLoS paper & book "The upright ape".

http://www.aans.org/education/journal/neurosurgical/Jul07/23-1-4-1187.pdf
From abstract:

IOW, our little uninformed boy hasn't read it.
Ever heard of the Moroto vertebra, my boy? Dorsal shift of the lumbar
transverse process in hominoids?

He just quoted it to you, Marc.
Here it is again
From abstract:
"The posterior superior iliac spine shifted far dorsal to the longissimus
insertion in the genus Homo between 1 and 2 million years ago, making this
muscle a powerful extensor of the lumbar spine. Functionally, the
establishment
of strong muscular flexors and extensors adds dynamic compressive stresses to
the lumbar disks and also makes these muscles susceptible to strain."

Yes, thanks, my boy, it proves how stupid Savanna Fantasts are: it is one of
the features that made Homo (after the H/P split c.5 Ma) different from
apiths+apes. Most likely for swimming. It hinders fast running (even human
runners run with more horizontal spines).
It has nothing to do with the dorsal shift of the transverse process c.22 Ma
(Moroto vertebra), of course, but perhaps even Savanna Fantasts knew that
(??). :-D


Again, for the Xth time:
Ilium:

Ancestral condition = apiths
= ape/monkey-like orientation of iliac blades
= iliac height as in Homo/monkeys (low)

Evolution towards Homo
= reorientation of iliac blades (see quote above)
= still low ilium

Evolution towards apes
= primitive orientation of ilia
= lengthening of iliac blades (>monkeys,apiths,Homo)

Got it finally, my boys?


.

Relevant Pages

  • Re: Evolution = gradual
    ... Ever heard of the Moroto vertebra, ... Dorsal shift of the lumbar ... this ability are seen in Homo habilis at 2.5 million years ago, ... = reorientation of iliac blades ...
    (sci.anthropology.paleo)
  • Re: Evolution = gradual
    ... Dorsal shift of the lumbar ... "The posterior superior iliac spine shifted far dorsal to the longissimus ... muscle a powerful extensor of the lumbar spine. ...
    (sci.anthropology.paleo)
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