Dinosaurs diversified in two steps during the Triassic. They originated about 245 Ma, during
the recovery from the Permian-Triassic mass extinction, and then remained insignificant until …

Acrodont dental implantation is widely considered an important character for referring fossil
material to Rhynchocephalia. Under its purest definition, acrodonty involves teeth being …

Mammals, birds, and squamates (lizards, snakes, and relatives) are key living vertebrates,
and thus understanding their evolution underpins important questions in biodiversity …

We describe a new small-bodied coelophysoid theropod dinosaur, Pendraig milnerae gen.
et sp. nov, from the Late Triassic fissure fill deposits of Pant-y-ffynnon in southern Wales. The …

The historical clade “Protorosauria” represents an important group of archosauromorph
reptiles that had a wide geographic distribution between the Late Permian and Late …

We use synchrotron x-ray tomography of annual growth increments in the dental cementum
of mammaliaforms (stem and crown fossil mammals) from three faunas across the Jurassic …

The acquisition of the load-bearing dentary–squamosal jaw joint was a key step in
mammalian evolution,,,–. Although this innovation has received decades of study, questions …

Despite considerable advances in knowledge of the anatomy, ecology and evolution of early
mammals, far less is known about their physiology. Evidence is contradictory concerning the …

The fissure fill localities of southwest England and South Wales are well‐known for
preserving rich assemblages of predominantly small‐bodied Late Triassic to Early Jurassic …

Triassic caves in south-west Britain contain a unique and diverse fauna of terrestrial
vertebrates, but their age is disputed since none of these taxa are known from surface strata …