Citation: Medina F.a et Ricciardi A.c, Tuberosciponoceras: a new dimorphic ammonoid genus from the Upper Albian of Patagonia, Argentina, Palaontologische Zeitschrift Palaontologische Zeitschrift (Print);Journal of Palaontologische Gesellschaft Scientific contributions to palaeontology, 81(2), 2007, pp. 123-130