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Iberomesornis : ウィキペディア英語版
Iberomesornis

''Iberomesornis'' ("Spanish intermediate bird") is a monotypic genus of enantiornithine bird of the Cretaceous of Spain.
==Discovery==
In 1985 the fossil of ''Iberomesornis'' was discovered by Armando Díaz Romeral in the Early Cretaceous Calizas de La Huérguina Formation at Las Hoyas, Cuenca Province, east central Spain, which dates to the late Barremian, roughly 125 million years ago. The find was first reported in 1988.〔Sanz, J.L., Bonaparte, J.F. & Lacasa, A., 1988, "Unusual Early Cretaceous birds from Spain", ''Nature'', 331: 433–435〕 In 1992 the type species ''Iberomesornis romerali'' was named and described by José Luis Sanz and José Fernando Bonaparte. The generic name is derived from Iberia and Greek μέσος, ''mesos'', "middle", en ὄρνις, ''ornis'', "bird", in reference to the intermediate status between the most basal and the modern birds. The specific name honours Romeral.〔Sanz, J. L. & Bonaparte, José F. (1992): "A New Order of Birds (Class Aves) from the Lower Cretaceous of Spain". In Jonathan J. Becker (ed.): ''Papers in Avian Paleontology Honoring Pierce Brodkorb. Natural History Museum of Los Angeles County Contributions in Science'' 36: pp. 38-49〕
The holotype specimen, LH-22, part of the Las Hoyas Collection, consists of a compressed articulated partial skeleton of an adult individual lacking the skull, the anterior neck and most of the hands. A second specimen, LH-8200, was referred to a ''Iberomesornis'' sp. in 1994, consisting of the left foot of an individual similar in size to the holotype.〔Sanz J.L. and Buscalioni, A.D., 1994, "An isolated bird foot from the Barremian (Lower Cretaceous) of Las Hoyas (Cuenca, Spain)", ''Géobios, Mémoire Spéciale''. 16: 213-217〕 After further preparation of the fossil, the species was redescribed by Paul Sereno in 2000.〔Sereno, P.C., 2000, "''Iberomesornis romerali'' (Ornithothoraces, Aves) re-evaluated as an enantiornithine bird", ''Neues Jahrbuch für Geologie und Paläontologie'' Abhandlungen 215: 365-395〕

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