The defining masterwork on the evolution of reptiles. Over 300 million years ago, an early
land vertebrate developed an egg that contained the embryo in an amnion, allowing it to be …

Kronosaurus boyacensis is the most famous and most important Lower Cretaceous marine
reptile fossil recovered from the Villa de Leyva region of Boyacá, Colombia, northern South …

Various Mesozoic marine reptile lineages evolved streamlined bodies and efficient lift-based
swimming, as seen in modern aquatic mammals. Ichthyosaurs had low-drag bodies, akin to …

Polycotylidae is a clade of plesiosaurians that appeared during the Early Cretaceous and
became speciose and abundant early in the Late Cretaceous. However, this radiation is …

Observations of temporal overlap of niche occupation among Late Cretaceous marine
amniotes suggest that the rise and diversification of mosasauroid squamates might have …

We report a new specimen of the plesiosaur Cardiocorax mukulu that includes the most
complete plesiosaur skull from sub-Saharan Africa. The well-preserved three-dimensional …

Plesiosaurian marine reptiles evolved a wide range of body shapes during the Jurassic and
Cretaceous, including long-necked forms. Many Late Cretaceous members of the clade …

Cryptoclidids are a major clade of plesiosauromorph plesiosaurians best known from the
Middle—Late Jurassic, but little is known regarding their turnover into the Early Cretaceous …

Plesiosaurs are an enigmatic, diverse extinct group of Mesozoic marine reptiles well known
for their unique body plan with two pairs of flippers and usually an elongated neck. The long …

Extreme neck elongation was a common evolutionary strategy among Mesozoic marine
reptiles, occurring independently in several lineages 1, 2. Despite its evolutionary success …