Benthic origin and earliest evolution of the first planktonic foraminifera after the Cretaceous/Palaeogene boundary mass extinction

Arenillas, Ignacio (Universidad de Zaragoza) ; Arz, José A. (Universidad de Zaragoza)

Resumen: There are several hypotheses on the origin and evolution of the earliest Danian planktonic foraminifera. Most experts suggest that they descended from a few opportunist planktonic foraminifera species, mainly of the genera Guembelitria and Hedbergella, which are usually considered to be survivors of the Cretaceous/Paleogene (K/Pg) boundary mass extinction. Nevertheless, early Danian specimens of Guembelitria and Hedbergella remained morphologically well separated from the associated parvularugoglobigerinids (i.e. Parvularugoglobigerina and Palaeoglobigerina), the first trochospiral planktonic foraminifera appearing after the K/Pg boundary event. The most likely alternative is a benthic origin for the parvularugoglobigerinids, which would be consistent with molecular phylogenetic studies that have suggested several episodes of benthic-planktonic transitions in the evolutionary history of planktonic foraminifera. A review of material from the El Kef section and other Tunisian sections supports the previous hypothesis that the buliminid genus Caucasina is the ancestor of the first parvularugoglobigerinids (i.e. Parvularugoglobigerina longiapertura and Palaeoglobigerina alticonusa), on the basis of similarities in test and apertural morphologies and wall texture. The intermediate morphotypes between caucasinids and parvularugoglobigerinids, which appeared approximately 3–5 kyr after the K/Pg boundary, are assigned to Pseudocaucasina antecessor gen. nov. sp. nov.

Idioma: Inglés

DOI: 10.1080/08912963.2015.1119133

Año: 2017

Publicado en: Historical Biology 29, 1 (2017), 25-42
ISSN: 0891-2963

Factor impacto JCR: 1.249 (2017)

Categ. JCR: PALEONTOLOGY rank: 27 / 53 = 0.509 (2017) - Q3 - T2

Factor impacto SCIMAGO: 0.542 - Agricultural and Biological Sciences (miscellaneous) (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E05
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2011-229121
Financiación: info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2011-23077
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2015-CIE-02

Tipo y forma: Artículo (PostPrint)

Área (Departamento): Área Paleontología (Dpto. Ciencias de la Tierra)