Nautilids from the Upper Cretaceous of the James Ross Basin, Antarctic Peninsula

Antarctic Science

MARCELA CICHOWOLSKI¹ 

[1] ALFREDO AMBROSIO

DOI  :  10.1017/S0954102005002671

学科分类：自然科学（综合）

来源: Cambridge University Press

【 摘 要 】

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.

【 授权许可】

Unknown