The only recorded member of the bird-like Troodontidae from Early Cretaceous North America is Geminiraptor suarezarum, known from an isolated maxilla recovered from the Suarez Site bonebed of the basa...

This study describes Tenuicruris piscanexum, gen. et sp. nov., the second Cretaceous bird named from Australia, based on a well-preserved tibiotarsus. Detailed morphological analysis and phylogenet...

Three species that lived about 308 million years ago challenge the idea that the first land vertebrates underwent amphibian-like metamorphosis.

A skeleton of the alvarezsauroid Alnashetri cerropoliciensis—representing a highly complete alvarezsauroid skeleton from South America—provides evidence on the evolution of the peculiar anatomy and mi...

The Romualdo Formation (Aptian–Albian) of the Araripe Basin is renowned for its exceptional three-dimensional fossil preservation, including a rich pterosaur assemblage. One of such pterosaurs from...

Sauropods achieved gigantism partly through neck elongation, but the role of soft tissues remains unclear. We reconstruct the craniocervical muscles of Amargasaurus cazaui (Lower Cretaceous, Argentin...

In South America, the fossil record of thyreophorans is scarce compared with that of Laurasian landmasses. The earliest finds date back to the first half of the twentieth century and consist of an ...

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