Analysis reveals unique neural canal structure in haplocanthosaurus caudal vertebrae, suggesting evolutionary significance.
A. Recovered skeletal elements of Haplocanthosaurus specimen MWC 8028. B. Caudal vertebra 3 in right lateral view. C. The same vertebra in posterior view. Lines show the location of sections for D and E. D. Midsagittal CT slice. The arrow indicates the ventral expansion of the neural canal into the centrum.
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Matt Wedel (2021) studied this question.
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