Birds are one of the most recognizable and diverse groups of modern vertebrates. Over the
past two decades, a wealth of new fossil discoveries and phylogenetic and …

Non‐avian dinosaurs went extinct 66 million years ago, geologically coincident with the
impact of a large bolide (comet or asteroid) during an interval of massive volcanic eruptions …

For 130 years, dinosaurs have been divided into two distinct clades—Ornithischia and
Saurischia. Here we present a hypothesis for the phylogenetic relationships of the major …

The early evolution of archosauromorphs during the Permo-Triassic constitutes an excellent
empirical case study to shed light on evolutionary radiations in deep time and the timing and …

Tetanuran theropods represent the majority of Mesozoic predatory dinosaur diversity and
the lineage leading to extant Aves. Thus their history is relevant to understanding the …

The most commonly cited apomorphy of Archosauriformes is an opening in the snout known
as the antorbital cavity. Despite the ubiquity and prominence of the antorbital cavity, its …

In post-Cambrian time, five events-the end-Ordovician, end-Frasnian in the Late Devonian,
end-Permian, end-Triassic, and end-Cretaceous-are commonly grouped as the “big five” …

The tectonics, geography and climate of the Cretaceous world were very different from the
modern world. At the start of the Cretaceous, the supercontinent of Pangaea had just begun …

Titanosauriforms represent a diverse and globally distributed clade of neosauropod
dinosaurs, but their inter-relationships remain poorly understood. Here we redescribe …

The geological and paleoenvironmental setting and the vertebrate taxonomy of the
fossiliferous, Cenomanian-age deltaic sediments in eastern Morocco, generally referred to …