Dinosaurs On 21 June, Gideon Algernon Mantell displays the fossils he would later name Iguanodon to the Geological Society, but arouses little interest.
Plesiosaurs New taxa Taxon Novelty Status Author(s) Age Unit Location Notes Images PlesiosaurusDe la Beche, H. T. & W. D. Conybeare. (1821). Notice of the discovery of a new fossil animal, forming a link between the Ichthyosaurus and crocodile, together with general remarks on the osteology of the Ichthyosaurus. Transactions of the Geological Society of London 5: 559–594 Gen. nov. Valid De la Beche & Conybeare Sinemurian Blue Lias Conybeare named the genus in Plesiosaurus 1821 without designating a type species. The genus was named on the basis of a complete skeleton discovered by Mary Anning.
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