Comparative analysis of neural canals in Haplocanthosaurus, Apatosaurus, and Rhea americana highlights unique anatomical features.
Anatomical features of the neural canal in birds and other dinosaurs. A. MWC 9698, a mid caudal vertebra of Apatosaurus in posterodorsal view. Arrows highlight probable vascular foramina in the ventral floor of the neural canal. B. LACM 97479, a dorsal vertebra of Rhea americana in left anterolateral view. Arrows highlight pneumatic foramina inside the neural canal.
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Matt Wedel (2021) studied this question.
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