Pelorosaurus

Pelorosaurus conybeari is the name given to a few sauropod dinosaur bones from the Lower Cretaceous period, about 138–112 million years ago. 
Bones of "Pelorosaurus" have been found in England and Portugal. It was a Brachiosaur, with front legs that were longer than its hind legs. 
The name has been challenged, and has been the subject of long-lasting dispute. Some palaeontologists prefer the name Cetiosaurus brevis.
The taxonomic status of "Pelorosaurus" is as a result very problematic. Technically, "Cetiosaurus brevis" is its type species. The position of "Pelorosaurus" is further undermined by the fact that several researchers hold that the genus is a "nomen dubium" ('doubtful name').
"Pelorosaurus" was one of the first dinosaurs described, and the naming procedures were not so well-developed at the time. Its life-style is assumed to be similar to other brachiosaurs, eating from the higher branches of tall conifer trees.