Istiorachis macarthurae: Isle of Wight’s “Real Godzilla” with Mᴀssive Sail-Back Stuns Paleontologists

In a sensational August 2025 announcement published in Papers in Palaeontology, researchers have officially named Istiorachis macarthurae — a striking sail-backed iguanodontian dinosaur from England’s Isle of Wight. Nicknamed the “real Godzilla” for its dramatic, elongated neural spines forming a towering sail along its back and tail, this Early Cretaceous giant (125–120 million years old) redefines what we know about display structures in ornithopods.

Led by Jeremy Lockwood of the University of Portsmouth, the team re-examined fossils originally collected in the 1970s from the WesSєx Formation and housed at Dinosaur Isle Museum in Sandown. The key specimen reveals hyper-elongated vertebrae creating an eye-catching sail — a feature far more extreme than in related iguanodontians. At roughly one tonne and the size of a large elephant, Istiorachis was a plant-eating biped that roamed lush, riverine floodplains alongside Iguanodon relatives.

The sail’s most likely function? Sєxual selection. Lockwood notes the exaggerated spines probably served as a flamboyant billboard for attracting mates or intimidating rivals, much like the crests of modern birds or the sails of ancient synapsids. Named after famed sailor Dame Ellen MacArthur (from the Isle of Wight), Istiorachis macarthurae (“sail spine” + MacArthur) honors both the creature’s anatomy and the island’s maritime heritage.

This discovery highlights the Isle of Wight as a dinosaur H๏τspot and shows how re-studying old collections can yield revolutionary finds. With the specimen now on public display, Istiorachis proves the Early Cretaceous was home to far more flamboyant “Godzillas” than previously imagined — living proof that Sєxual display drove some of evolution’s wildest experiments.