Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

IF 2.3 2区地球科学 Q1 PALEONTOLOGY

Papers in Palaeontology Pub Date : 2024-03-10 DOI:10.1002/spp2.1549

Daiane Ceolin, Marcos Antonio B. Santos Filho, Andrea Concheyro, Gerson Fauth

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Abstract

This work presents a taxonomic, palaeoecological and palaeobiogeographical study of the ostracod fauna around the Cretaceous–Palaeogene boundary from the El Matuasto section, Neuquén Basin, Argentina. The analysis of 64 samples resulted in the recovery of 82 marine ostracod species, of which four are new: Hemiparacytheridea condilomata, Paramunseyella stictus, Hysterocythereis acuminata and Aleisocythereis? picnus. In addition, the genera Sapucariella, Monoceratina, Aracajuia, Microceratina and Pelecocythere are reported for the first time from the Neuquén Basin. Palaeoecological inferences indicate fluctuations in abundance and diversity, occurring alongside environmental change from an inner to medium shelf during the Maastrichtian and to an outer shelf in the Danian. The Maastrichtian fauna was less abundant than that in the Danian, which shows a rapid recovery after the Cretaceous–Palaeogene boundary. During the Danian, a small interval also shows a sudden decrease in abundance and diversity that could potentially be related to the Dan-C2 event. In addition, the described genera and species in this study suggest a strong palaeobiogeographical affinity with the Paraíba Basin, northeastern Brazil.

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阿根廷内乌肯盆地 El Matuasto 断面白垩纪-古新世边界的梭形纲动物：分类学、古生态学和古生物地理学推论

本研究对阿根廷内乌肯盆地埃尔马图阿斯托剖面白垩纪-古新世界线附近的浮游动物群进行了分类学、古生态学和古生物地理学研究。通过对 64 个样本的分析，发现了 82 个海洋介壳动物物种，其中 4 个为新物种：Hemiparacytheridea condilomata、Paramunseyella stictus、Hysterocythereis acuminata 和 Aleisocythereis?此外，内乌肯盆地还首次报告了 Sapucariella、Monoceratina、Aracajuia、Microceratina 和 Pelecocythere 属。古生态学推断表明，随着环境的变化，动物的数量和多样性也发生了波动，在马斯特里赫特期，动物从内陆架迁移到中陆架，在达尼安期又迁移到外陆架。马斯特里赫特动物群的数量少于达尼安动物群，达尼安动物群在白垩纪-古近纪边界之后迅速恢复。在达尼安时期，也有一小段时期的动物数量和多样性突然减少，这可能与 Dan-C2 事件有关。此外，本研究中描述的属和种表明，它们与巴西东北部的帕拉伊巴盆地（Paraíba Basin）具有很强的古生物地理亲缘关系。

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来源期刊

Papers in Palaeontology PALEONTOLOGY-

CiteScore

4.50

自引率

4.30%

发文量

期刊介绍： Papers in Palaeontology is the successor to Special Papers in Palaeontology and a journal of the Palaeontological Association (www.palass.org). The journal is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. Papers in Palaeontology is devoted to the publication of papers that document the diversity of past life and its distribution in time and space. As a sister publication to Palaeontology its focus is on descriptive research, including the descriptions of new taxa, systematic revisions of higher taxa, detailed biostratigraphical and biogeographical documentation, and descriptions of floras and faunas from specific localities or regions. Most contributions are expected to be less than 30 pp long but longer contributions will be considered if the material merits it, including single topic parts. The journal publishes a wide variety of papers on palaeontological topics covering: palaeozoology, palaeobotany, systematic studies, palaeoecology, micropalaeontology, palaeobiogeography, functional morphology, stratigraphy, taxonomy, taphonomy, palaeoenvironmental reconstruction, palaeoclimate analysis, biomineralization studies.