What key anatomical structure, cataloged as R2095, is the sole fossil evidence for *Xenoposeidon proneneukos*?

Answer

Mid-to-posterior dorsal vertebra

The scientific entirety of *Xenoposeidon proneneukos* rests upon a single, singular fossil element. This unique bone is identified specifically as a mid-to-posterior dorsal vertebra. This means the fossil records the middle or rear portion of the dinosaur's back structure. The importance of this solitary piece is magnified precisely because it is the only known physical proof, and its associated geological data—the where and when—is what provides its crucial scientific value in tracing sauropod evolution, despite the lack of other skeletal parts.

What key anatomical structure, cataloged as R2095, is the sole fossil evidence for *Xenoposeidon proneneukos*?
locationfossildinosaursauropod