SPINOSAURUS
THE BIGGEST CARNIVOROUS DINOSAUR
Spinosaurus, or “spined reptile,” was named for its “sail back” feature, created by tall vertebral spines. The large neural spines, up to 1.8m (6 feet) long, came out of its back vertebrae, probably forming a sail-like fin that may have helped in thermoregulation, mating rituals and/or intraspecies rivalry. Spinosaurus had a relatively flexible upper spine (these vertebrae had modified ball-and-socket-joints) so it could arch its back somewhat, perhaps being able to spread the sail (like opening the ribs of a fan). Related taxa in the family Spinosauridae include Baryonyx from England, Irritator from Brazil, and Suchomimus from Niger.
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