Iguanodon reconstruction by Gideon Mantell

Based on the skeletal anatomy of a modern lizard, Gideon Mantell (1790-1852) placed the spike-like thumb on the nose, like the horn of a rhino. This misunderstanding persisted for many years

Algernon Ankylopollexia Archosaur Archosauria Archosauriformes Archosauromorpha Bipedal Cerapoda Diapsid Diapsida Dinosauria Dinosauromorpha Dryomorpha Euornithopoda Genasauria Gideon Hadrosauriformes Iguanodon Iguanodont Iguanodontae Iguanodontia Iguanodontidae Iguanodontoidea Mantell Mistake Ornithischia Ornithischian Ornithopod Ornithopoda Phanerozoic Reptiles Reptilia Theory Thumb

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