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The Middle–Upper Jurassic Oxford Clay Formation of the UK is a highly productive fossiliferous unit, containing numerous fossils of marine and terrestrial vertebrates. Despite this abundance, pterosaurs make up only a tiny percentage of the assemblage. There are currently only seven specimens accessioned in the Oxford University Museum of Natural History and Natural History Museum, London. Of these, only one specimen (an association of material from a juvenile animal) has been named, identified as Rhamphorhynchus jessoni. Following a detailed examination, it is identified here as lacking any autapomorphies and the species R. jessoni is considered a nomen...

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