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Monolophosaurus and spinosaurs

Random observations with possible relevance to the origin of

I was just looking at a figure of the skull of the ?basal tetanuran/?basal
avetheropod _Monolophosaurus jiangi_ and noticed some interesting
similarities to the reconstructed spinosaurid skull in the _Suchomimus_
paper.  The elongate external naris, lacrimal, and triradiate maxilla are
somewhat similar in the two skulls, and even the nasal crest, buttressed
in both cases by a flange of the lacrimal, shows some similarity.  But
what is really strikingly similar are the jaws, particularly the long,
shallow, curved dentaries.

Take it for what it's worth.


Sereno et al. "A Long-Snouted Predatory Dinosaur from Africa and the
Evolution of Spinosaurids." _Science_, vol. 282, pp. 1298-1302 (13 Nov

Xi-Jin Zhao and Philip J. Currie. "A Large Crested Theropod from the
Jurassic of Xinjiang, People's Republic of China." _Canadian Journal of
Earth Sciences_, vol. 30, nos. 10 & 11, pp. 2027-2036 (Oct-Nov 1993).

Nick Pharris
Pacific Lutheran University
Tacoma, WA 98447