A new notosuchian crocodyliform from the Paleocene of Patagonia and the survival of a large-bodied terrestrial lineage across the K–Pg mass extinction

Sebecid notosuchians are the only terrestrial crocodyliforms to survive the Cretaceous–Paleogene extinction, 66 Ma, which eliminated large-bodied species (~>5 kg) in terrestrial ecosystems. Early sebecid evolution is unclear due to the scarcity of remains from both sides of the boundary. We present the stratigraphically earliest post-extinction notosuchian record, from the lower Paleocene Salamanca Formation of Patagonia. Tewkensuchus salamanquensis n. gen. n. sp. has unique features, including a skull roof with elevated lateral margins, and an accessory peg and socket articulation between the postorbital and posterior palpebral. Our phylogenetic analysis allies Tewkensuchus with a clade of predatorial crocodyliforms from the Eocene of Europe (and possibly of Africa, as Eremosuchus may belong to this clade). This clade forms the sister taxon of South American sebecids. We name Sebecoidea for this more inclusive clade of Eurogondwanan notosuchians and suggest that its spatial distribu..., , , # A new notosuchian crocodyliform from the Paleocene of Patagonia and the survival of a large-bodied terrestrial lineage across the K–Pg mass extinction

[https://doi.org/10.5061/dryad.8kprr4xxr](https://doi.org/10.5061/dryad.8kprr4xxr)

# Title of dataset:

A new notosuchian crocodyliform from the Paleocene of Patagonia and the survival of a large-bodied terrestrial lineage across the K–Pg mass extinction. Supporting data

# Author Information:

A. Investigator Contact Information
Name: Gonzalo Gabriel Bravo
Institution: CONICET, Instituto Superior de Correlación Geológica, Universidad Nacional de Tucumán, Facultad de Ciencias Naturales e I.M.L., Av. Presidente Perón S/N, Yerba Buena, 4107, Tucumán, Argentina.
Email: [[e-mail]](mailto:[e-mail])

B. Co-investigator Contact Information
Name: Diego Pol
Institution: CONICET, Museo Argentino de Ciencias Naturales Bernardino Rivadavia (MACN), Av. Ángel Gallardo 470, C1405DJR,Buenos Aires, Argentina.
Email: [cacopol@...,