What specific term denotes the large, deep pneumatic hollows observed in *Xenoposeidon*'s vertebrae?
Answer
Pleurocoels
The structurally significant feature that distinguishes the massive vertebrae of *Xenoposeidon* is their unique internal architecture. This architecture is characterized by the presence of large, deep pneumatic hollows, which are specifically termed *pleurocoels*. These structures are critical because they represent extreme modification of the bone structure, designed for weight reduction while maintaining the strength required to support the animal's inferred gigantism. The unique expression and placement of these pleurocoels relative to other sauropods suggest a highly specialized and distinct evolutionary pathway for this particular dinosaur.
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