Ilerdopteryx is an extinct genus of birds, perhaps an enantiornithine, from the Lower Cretaceous La Pedrera de Rúbies Formation lithographic limestone of Spain. The type species, I. viai,A. Lacasa Ruiz. (1985). Nota sobre las plumas fósiles del yacimiento eocretácico de “La Pedrera-La Cabrua” en la Sierra del Montsec (prov. Lleida, España) Ilerdopteryx viai n. g. n. sp. Illerda 46:227-237 is known only from a collection of isolated contour feathers.Kellner, A. (2002). "A review of avian Mesozoic fossil feathers." pp. 389–404. in Chiappe and Witmer, (eds.). Mesozoic Birds: Above the Heads of Dinosaurs. Berkeley: University of California Press.
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