A new crocodylomorph related ootaxon from the late Maastrichtian of the Southern Pyrenees (Huesca, Spain)

Moreno Azanza, Miguel (Universidad de Zaragoza) ; Pérez Pueyo, Manuel (Universidad de Zaragoza) ; Puértolas Pascual, Eduardo (Universidad de Zaragoza) ; Núñez Lahuerta, Carmen ; Mateus, Octavio ; Bauluz, Blanca (Universidad de Zaragoza) ; Bádenas, Beatriz (Universidad de Zaragoza) ; Canudo, José Ignacio (Universidad de Zaragoza)

Resumen: Crocodylomorph eggs and eggshells are known as old as the Late Jurassic and are frequent components of most multiootaxic eggshell assemblages. Classified within the oofamily Krokolithidae, thei histo- and ultrastructures are conservative throughout geological time, characterised by inverted-trapezoid-shaped shell units that grow from highly spaced basal knobs and present a diagnostic tabular ultrastructure. Here, we report 327 eggshell fragments from a new fossil site from the Maastrichtian of the Southern Pyrenees, Veracruz 1, and erect a new oogenus and oospecies, Pachykrokolithus excavatum oogen. et oosp. nov. characterised by crocodyloid morphotype and a prominent rugosocavate ornamentation. Eggshells from the slightly older locality of Blasi 2b, previously reported as aff. Krokolithidae, are also assigned to this new ootaxon. Different crocodylomorph taxa coexisted during the Late Cretaceous of the Tremp Basin, hindering the attribution of Pachykrokolithus excavatum oogen. et oosp. nov. to a single clade. Nevertheless, allodaposuchid eusuchians were dominant in this ecosystem, and are the most probable producers of Pachykrokolithus excavatum oogen. et oosp. nov. eggs.

Idioma: Inglés

DOI: 10.1080/08912963.2022.2098024

Año: 2023

Publicado en: Historical Biology 35, 8 (2023), 1460-1469
ISSN: 0891-2963

Financiación: info:eu-repo/grantAgreement/ES/MICINN/FJCI-2020-044561-I
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2021-122612OB-I00
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PLEC2021-008203/AEI/10.13039/501100011033

Tipo y forma: Article (PostPrint)

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