A second species, Anoplosaurus major, "the larger one", was named by Seeley in 1879 for a neck vertebra and three partial caudal vertebrae he removed from the material previously referred to Acanthopholis stereocercus, from the same formation as the type species.
A second species of dinosaur, Anoplosaurus major ("the larger one"), was named by Seeley in 1879 from a neck vertebra and three partial caudal vertebrae he extracted from the material previously designated Acanthopholis stereocercus, from the same geological formation as the type specimen.