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The first dinosaur to be named from Spain, the sauropod Aragosaurus ischiaticus Sanz, Buscalioni, Casanovas and Santafé 1987, is known from associated postcranial remains of one individual from the Las Zabacheras site in Galve, Teruel Province, Spain. Results of recent fieldwork confirm that the Las Zabacheras site represents a deltaic sediment complex in the Villar del Arzobispo Formation with a Tithonian–Berriasian (latest Jurassic–earliest Cretaceous) age. Description of the anatomy of Aragosaurus (including several previously undescribed elements) enables a re-evaluation of this taxon's relationships. Aragosaurus ischiaticus has six autapomorphies in the axial and appendicular skeleton, including the presence of epipophysis-like protuberances on middle caudal postzygapophyses. Phylogenetic analyses, using three independent data sets, support the view that Aragosaurus is a basal …