On Tetrapod Zoology, a superb blog maintained by my acquaintance, paleogeologist Darren Naish, is a new entry describing
"Xenoposeidon proneneukos Taylor & Naish, 2007, an enigmatic and morphologically bizarre Lower Cretaceous neosauropod from the Wealden Supergroup rocks of East Sussex, described in the new issue of Palaeontology (Taylor & Naish 2007).
The new species is based on a single vertebra, about 20 cm long and 30 cm high, found in the Natural History Museum of London after roughly 115 years of being overlooked in storage. Paleontological enthusiast Mike Taylor brought it to Dr. Naish's attention, and the two co-authored the description. Without getting bogged down in the details, the bone shows at least three characteristics unknown in any other sauropod species from any location, indicating it belonged to its own family with a unique ancestry.