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The Harmsworth Encyclopaedia 1930s / 1940s - Vintage black and white illustration of a Skeleton of Iguanodon, reptile. Iguanodon, named in 1825, is a genus of ornithopod dinosaur that existed roughly halfway between the first of the swift bipedal hypsilophodontids of the mid-Jurassic and the duck-billed dinosaurs of the late Cretaceous.