by altispinax do you mean becklespinax altispinax?
Later researchers considered Altispinax a nomen dubium because the single tooth was undiagnostic. No relationship could be proven between the tooth and the vertebrae. The vertebrae were therefore given a new name in 1988 by Gregory Paul. Paul considered them to represent a possible new species of Acrocanthosaurus , which he named Acrocanthosaurus? altispinax . The specific name was deliberately made identical to the old generic name, to emphasize that both referred to the vertebrae. As indicated by the question mark, Paul himself was uncertain about this assignment. For this reason, in 1991 a new genus, Becklespinax , was named for the vertebrae by George Olshevsky, in honour of the original discoverer, Beckles. The new combination name of the type species Acrocanthosaurus? altispinax thus became Becklespinax altispinax . The species names Altispinax altispinax  and Altispinax lydekkerhueneorum  are its junior objective synonyms.