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In the present work the remains of mastodonts from the middle Miocene of Tarazona de Aragon (Zaragoza) are studied and their taxonomic classification to Gomphotherium, Zigolophodon or Archaeobelodon is discussed. The teeth studied are of bunodont type. The upper incisors present ventral enamel ribbon on the apex. The lower incisors exhibit piriform-flattened transversal sections. The above mentioned features exclude their classification as Z. turiscensis. The dorsoventrally flat-shaped lowers incisors of Tarazona seem to suggest the presence of Amebelodontidae family but due to other features these pieces have been attributed to G. angustidens. Furthermore, some diagnostic-charasteristics of the genus Archaeobelodon are discussed. Se han estudiado los restos de mastodontes del Mioceno medio de Tarazona de Arag&#243;n (Prov. de Zaragoza) discuti&#233;ndose su asignaci&#243;n a Gomphotherium, Zigolophodon o Archaeobelodon. La dentici&#243;n yugal estudiada es bunodonta. Las defensas superiores presentan banda de esmalte en posici&#243;n ventral en el &#225;pice y los incisivos inferiores tienen secciones transversales piriforme-aplastadas. Las caracter&#237;sticas mencionadas excluyen la atribuci&#243;n de este material a Z. turicensis. Por otro lado, a&#250;n a pesar del aplastamiento dorso-ventral que muestran las defensas inferiores, morfolog&#237;a atribuible, en principio a los Amebelodontidae, las dem&#225;s caracter&#237;sticas del material estudiado hacen que &#233;ste se haya asignado en su totalidad a G. angustidens, discuti&#233;ndose, asimismo, la validez de algunos caracter&#237;sticas diagn&#243;stico del g&#233;nero Archaeobelodon

Los mastodontes (Proboscidea, Mammalia) del Mioceno Medio de Tarazona de Aragón (Zaragoza, España)