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Reappraisal of the thalattosuchian crocodylomorph record from the Middle-Upper Jurassic Rosso Ammonitico Veronese of northeastern Italy: Age calibration, new specimens and taphonomic biases. | LitMetric

AI Article Synopsis

  • Aquatic crocodylomorphs from the Middle to Upper Jurassic period in northeastern Italy have intrigued scientists since the late 18th century, focusing especially on the Thalattosuchia group.
  • Despite previous studies, many specimens still lack detailed documentation and some remain undescribed; this research offers a thorough revision of their record and age using calcareous nannofossils.
  • Three new metriorhynchoid specimens were identified from the Asiago Plateau, providing evidence of an early origin of Metriorhynchoidea and indicating their rapid colonization of open-ocean environments in the Tethys region.

Article Abstract

Despite their extremely rare and fragmentary record, aquatic crocodylomorphs from the Middle to Upper Jurassic (Bajocian-Tithonian) Rosso Ammonitico Veronese (RAV) of northeastern Italy have sparked interest since the late 18th century. Among marine reptiles, Thalattosuchia is by far one of the best represented groups from the RAV units, especially in the Middle Jurassic. Although some specimens have been the subject of multiple studies in recent times, most of them still lack precise stratigraphic assignment and taphonomic assessment, while others remain undescribed. Here we provide a comprehensive revision of the thalattosuchian record from the RAV, alongside the most up-to-date age determination, by means of calcareous nannofossils, when available. Three new metriorhynchoid specimens are described for the first time from the Middle Jurassic of Asiago Plateau (Vicenza province). While the taphonomy of the newly described specimens hampers any taxonomic attribution below superfamily/family level, all three were confidently assigned to a precise interval between the upper Bajocian and the upper Bathonian. This revised record has major paleobiogeographical implications: the new specimens confirm an early origin and distribution of Metriorhynchoidea in the Tethys area and suggest a fast colonization of the open-ocean environment since the upper Bajocian.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10615311PMC
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0293614PLOS

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