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

Miguel Moreno-Azanza, Manuel Pérez-Pueyo, Eduardo Puértolas-Pascual, Carmen Núñez-Lahuerta, Octávio Mateus, Blanca Bauluz, Beatriz Bádenas, José Ignacio Canudo

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Number of pages11
JournalHistorical Biology
Early online date21 Jul 2022
DOIs
Publication statusE-pub ahead of print - 21 Jul 2022

Keywords

  • Crocodylomorpha
  • eggshell fragments
  • Krokolithidae
  • Late Cretaceous
  • Tremp Basin

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