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.

Related Questions
What catalog number identifies the singular *Xenoposeidon proneneukos* dorsal vertebra specimen?Which specific locale near Hastings is the most likely unearthing site for the *Xenoposeidon* vertebra?The exposed rock layers at Ecclesbourne Glen, where R2095 was found, belong to which specific geological formation?What precise geological age is estimated for the *Xenoposeidon* vertebra based on its Ecclesbourne Glen location?What geological Supergroup encompasses the geological context of the *Xenoposeidon* find?Which ancient landmass, defined by early Cretaceous geography, did *Xenoposeidon*'s presence confirm as a habitat for Rebbachisaurids?What key anatomical structure, cataloged as R2095, is the sole fossil evidence for *Xenoposeidon proneneukos*?What other major sauropod group is mentioned alongside Titanosauria as potentially existing in the Hastings Beds Group during the Early Cretaceous?What depositional environment does the Ashdown Formation at Ecclesbourne Glen typically represent?Relative to the Wessex Formation, how does the geological age of the Hastings Beds Group containing *Xenoposeidon* compare?