Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula

• Main Authors: Cichowolski, Marcela, Ambrosio, Alfredo L., Concheyro, Graciela Andrea
• Language: unknown
• Published: 2005
• Subjects: Campanian; Embryonic conch; Eutrephoceras; Maastrichtian; Palaeoecology; Seymour Group; Cretaceous; Antarctic Peninsula; Antarctica; Arctic and Antarctic; James Ross Island; Seymour Island; Snow Hill Island; West Antarctica; World; Nautilida; Polaribacter; Antarctic; Arctic; Argentina; Hill Island; Ross Island; Seymour; Snow Hill; The Antarctic; Antarc*
• Online Access: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v17_n2_p267_Cichowolski; https://hdl.handle.net/20.500.12110/paper_09541020_v17_n2_p267_Cichowolski

To date, Cretaceous nautilids from the Antarctic Peninsula have received little attention and only a single species had been reported, Eutrephoceras simile Spath, from Seymour, Snow Hill, and James Ross islands. Currently, it is considered a synonym of Eutrephoceras subplicatum (Steinmann), which has also been described from the Upper Cretaceous of central Chile, southern Argentina and Angola. Here, we report and describe E. subplicatum in detail, based on specimens from the Lower Campanian-Maastrichtian of Vega, Seymour and James Ross islands, presenting, for the first time, embryonic conch features related to the palaeoecology of these organisms. The nauta of this species had a diameter of approximately 30 mm with 5-6 septa. In addition, we describe a new species, Eutrephoceras antarcticum, and one specimen assigned to the same genus in open nomenclature, both recovered from the Lower Campanian beds of James Ross Island. © Antarctic Science Ltd. Fil:Cichowolski, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ambrosio, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Concheyro, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.