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Thecocoelurus
''Thecocoelurus'' is a dubious genus of theropod dinosaur from the early Cretaceous period of England. It is paleontologically significant for being one of the first two ornithomimosaur specimens known from England (along with ''Valdoraptor''), and represents the earliest record of ornithomimosaurs in the world.
==Discovery and naming==
''Thecocoelurus'' is known only from half of a single cervical vertebra, discovered by the Rev. William Darwin Fox on the Isle of Wight during the 19th century. After his death the ''Fox Collection'' was acquired by the British Museum of Natural History. William Davies was the first to notice the specimen and assumed a close affinity with ''Coelurus''.
It was described by Harry Govier Seeley in 1888. Seeley named the fossil ''Thecospondylus daviesi'', referring it to a genus he had named earlier for the incomplete cast of a sacrum.〔Seeley, H.G., 1888, "On ''Thecospondylus Daviesi'' (Seeley), with some remarks on the classification of the Dinosauria", ''Quarterly Journal of the Geological Society of London'', 44: 79-86〕 However, in 1901 Baron Franz Nopcsa renamed it ''Coelurus daviesi''.〔Nopcsa, F., 1901. "Synopsis und Abstammung der Dinosaurier", ''Földtany Közlöny'' 30 (1901): 247-279〕 In 1923 Friedrich von Huene decided that it should be removed from either ''Thecospondylus'' or ''Coelurus'' and given its own genus, ''Thecocoelurus''. The generic name is a contraction of "Thecospondylus" and "Coelurus".〔Huene, F. von, 1923, "Carnivorous Saurischia in Europe since the Triassic", ''Bulletin of the Geological Society of America'', 34: 449-458〕
The holotype, NHMUK PV R181, was found in debris from a layer of the Wessex Formation, dating from the Barremian. It consists of the anterior end, about a third, of a cervical vertebra estimated by Seeley to have been nine centimetres long.
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