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

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 ha...

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Autores principales: Cichowolski, Marcela, Ambrosio, Alfredo L., Concheyro, Graciela Andrea
Publicado: 2005
Materias:
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
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v17_n2_p267_Cichowolski
http://hdl.handle.net/20.500.12110/paper_09541020_v17_n2_p267_Cichowolski
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09541020_v17_n2_p267_Cichowolski
record_format dspace
spelling paper:paper_09541020_v17_n2_p267_Cichowolski2023-06-08T15:55:44Z Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula Cichowolski, Marcela Ambrosio, Alfredo L. Concheyro, Graciela Andrea Campanian Embryonic conch Eutrephoceras Maastrichtian Palaeoecology Seymour Group Campanian Cretaceous Antarctic Peninsula Antarctica Arctic and Antarctic James Ross Island Seymour Island Snow Hill Island West Antarctica World Eutrephoceras Nautilida Polaribacter 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. 2005 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v17_n2_p267_Cichowolski http://hdl.handle.net/20.500.12110/paper_09541020_v17_n2_p267_Cichowolski
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Campanian
Embryonic conch
Eutrephoceras
Maastrichtian
Palaeoecology
Seymour Group
Campanian
Cretaceous
Antarctic Peninsula
Antarctica
Arctic and Antarctic
James Ross Island
Seymour Island
Snow Hill Island
West Antarctica
World
Eutrephoceras
Nautilida
Polaribacter
spellingShingle Campanian
Embryonic conch
Eutrephoceras
Maastrichtian
Palaeoecology
Seymour Group
Campanian
Cretaceous
Antarctic Peninsula
Antarctica
Arctic and Antarctic
James Ross Island
Seymour Island
Snow Hill Island
West Antarctica
World
Eutrephoceras
Nautilida
Polaribacter
Cichowolski, Marcela
Ambrosio, Alfredo L.
Concheyro, Graciela Andrea
Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
topic_facet Campanian
Embryonic conch
Eutrephoceras
Maastrichtian
Palaeoecology
Seymour Group
Campanian
Cretaceous
Antarctic Peninsula
Antarctica
Arctic and Antarctic
James Ross Island
Seymour Island
Snow Hill Island
West Antarctica
World
Eutrephoceras
Nautilida
Polaribacter
description 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.
author Cichowolski, Marcela
Ambrosio, Alfredo L.
Concheyro, Graciela Andrea
author_facet Cichowolski, Marcela
Ambrosio, Alfredo L.
Concheyro, Graciela Andrea
author_sort Cichowolski, Marcela
title Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
title_short Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
title_full Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
title_fullStr Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
title_full_unstemmed Nautilids from the upper cretaceous of the James Ross Basin, Antarctic Peninsula
title_sort nautilids from the upper cretaceous of the james ross basin, antarctic peninsula
publishDate 2005
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v17_n2_p267_Cichowolski
http://hdl.handle.net/20.500.12110/paper_09541020_v17_n2_p267_Cichowolski
work_keys_str_mv AT cichowolskimarcela nautilidsfromtheuppercretaceousofthejamesrossbasinantarcticpeninsula
AT ambrosioalfredol nautilidsfromtheuppercretaceousofthejamesrossbasinantarcticpeninsula
AT concheyrogracielaandrea nautilidsfromtheuppercretaceousofthejamesrossbasinantarcticpeninsula
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