Revalidation of the genus Chiloguembelitria Hofker: Implications for the evolution of early Danian planktonic foraminifera

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

Resumen: Guembelitria is the only planktonic foraminiferal genus whose survival from the mass extinction event of the Cretaceous/Paleogene (K/Pg) boundary has been clearly proven. The evolution of Guembelitria after the K/Pg boundary led to the appearance of two guembelitriid lineages in the early Danian: one biserial, represented by Woodringina and culminating in Chiloguembelina, and the other trochospiral, represented by Trochoguembelitria and culminating in Globoconusa. We have re-examined the genus Chiloguembelitria, another guembelitriid descended from Guembelitria and whose taxonomic validity had been questioned, it being considered a junior synonym of the latter. Nevertheless, Chiloguembelitria differs from Guembelitria mainly in the wall texture (pustulate to rugose vs. pore-mounded) and the position of the aperture (umbilical-extraumbilical to extraumbilical vs. umbilical). Chiloguembelitria shares its wall texture with Trochoguembelitria and some of the earliest specimens of Woodringina, suggesting that it played an important role in the evolution of early Danian guembelitriids, as it seems to be the most immediate ancestor of both trochospiral and biserial lineages. Morphological and morphostatistical analyses of Chiloguembelitria discriminate at least five species: Chg. danica, Chg. irregularis, and three new species: Chg. hofkeri, Chg. trilobata and Chg. biseriata.

Idioma: Inglés

DOI: 10.1016/j.jafrearsci.2017.07.011

Año: 2017

Publicado en: Journal of African Earth Sciences 134 (2017), 435-456 [72 p.]
ISSN: 1464-343X

Factor impacto JCR: 1.532 (2017)

Categ. JCR: GEOSCIENCES, MULTIDISCIPLINARY rank: 122 / 189 = 0.646 (2017) - Q3 - T2

Factor impacto SCIMAGO: 0.681 - Geology (Q2) - Earth-Surface Processes (Q2)

Financiación: info:eu-repo/grantAgreement/ES/DGA/E05
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2015-64422-P
Financiación: info:eu-repo/grantAgreement/ES/UZ/UZ2015-CIE-02

Tipo y forma: Artículo (PostPrint)

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