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Ossified tendon lattices in ornithischians
Hello all! Now, taking a dramatic jump through the cladograms, I now turn
from coelurosaurs to ornithischians to delve into their anatomy, because I
think that these are cool, as I do coelurosaurs, but I know jack about
Er... now assuming a much, much more serious nature which may be good thing,
because I doubt anyone will appreciate having wierd jokes mixed all
throughout this post.
-- The separation between humor and seriousness starts now --
I am overviewing the interrelationships of certain ornithischians and
preparing a data matrix. The best of my current resources, IMHO, is Norman
1990. This has more data than any of my other ornithischian refs. I was
writing out characters from his "Comments upon iguanodontian systematics"
section and I noticed he uses "rhomboidal lattice of ossified tendons" as a
unsubstantiated character supporting the unity of *Iguanodon*,
*Ouranosaurus*, *Probactrosaurus*, and Hadrosauridae. He also comments that
the character is size related.
My personal observations from reading the literature, looking over
photographs, and my photographs from the Carnegie displays seem to provide a
confusing situation. Some taxa have these structures over just their
dorsals and sacrals (ceratopsians, heterodontosaurids), others have them
across their posterior dorsals, sacrals and anterior caudals (hadrosaurids,
Iguanodon, Ouranosaurus), and others have their distal tails engulfed in
them, with smaller structures across their dorsals, sacrals, and anterior
Can anyone spread light on how this character should be considered?
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