Apatosaurus

Apatosaurus, often incorrectly referred to as Brontosaurus, was a type of sauropod dinosaur on prehistoric Earth. They were big, bulky, vegetarians with incredibly long necks. A few Apatosaurs were briefly transported to 1970s-era London by Operation Golden Age. (DW: Invasion of the Dinosaurs) This was mentioned by the Fourth Doctor following his regeneration. (DW: Robot)

Behind the scenes

 * In taxonomy, the name applied to the first discovered specimen has primacy. The names of subsequent finds were misidentified as different genuses which, when correctly identified, were reclassified. The first "Brontosaurus" was a larger and more complete skeleton which led this name to become more rooted in popular culture.
 * According to non-narrative material in DWBIT 7, the Apatosaurus was also native to the planet Raxas. Unlike most of the other dinosaur species on Raxas, they were rather non-violent.