What shape is the neural canal described as being at its front end in the Xenoposeidon vertebra?
Answer
Teardrop-shaped
The internal structure of the *Xenoposeidon* vertebra includes the neural canal, which is the opening through which the spinal cord would have passed. Analysis of the preserved sections reveals that this canal is not uniform throughout its length. Specifically, at its front end, the opening exhibits a distinct teardrop shape. As the canal progresses toward the back opening of the vertebra, this shape transitions, becoming small and circular. This structural detail, along with the deep concavity of the centrum's posterior face and the 35-degree anterior slope of the arch, forms part of the unique anatomical signature of this fossil.
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