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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Bibliographic Details
Published in:Antarctic Science
Main Authors: CICHOWOLSKI, MARCELA, AMBROSIO, ALFREDO, CONCHEYRO, ANDREA
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2005
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Antarctic
The Antarctic
Antarctic Peninsula
Ross Island
Argentina
Seymour
Snow Hill
Antarc*
Antarctic Science
James Ross Island
Online Access:http://dx.doi.org/10.1017/s0954102005002671
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102005002671
Description
Summary: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.

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