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RE: Nothronychus graffami
Possibly one of the most graviportal theropods I have ever seen. Apart from
the massive development of the sacrum, ilium, and pes, this animal possesses
extreme development of the anterior dorsal neural spines, a slender and rotated
scapular shaft that almost certainly indicates a broad anterior throacic
cavity, and a long craniocaudal development of the pubic/ischium profile, such
that it was longer cranio-caudally than in other therizinosaurs (segnosaurs!
someone should resurrect that name when it becomes meaningful taxonomically).
Development of a large semi-cubic tuberosity -- proximal to the distal iliac
terminus and confluent with the antitrochanter -- on the ilium and the
progressive lengthening of the metatarsals, where even the first metatarsal
contacts the tarsus, and with the fourth metatarsal being the longest in the
pes, imply derived graviportalism within theropods. Pedal unguals are dewcurved
relatively to other therizinosaurs, and show that they were more likely used in
locomotion than anything else.
What a strange beastie. (But that's par for the course with segnosaurs,
Jaime A. Headden
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