Acrocanthosaurus: the high‑spined theropod of the Lower Cretaceous Acrocanthosaurus Acrocanthosaurus was a large high‑spined theropod from Lower Cretaceous North America, notable for tall neural spines, robust forelimbs, and its likely placement among the carcharo…
Aegyptosaurus — African titanosaurian sauropod Aegyptosaurus Aegyptosaurus, a titanosaurian sauropod from the Upper Cretaceous of northern Africa, is known from early 20th‑century discoveries (many since lost) and is important for understand…
Alectrosaurus — a Late Cretaceous tyrannosauroid from Asia Alectrosaurus Alectrosaurus was a lightly built, fast-running tyrannosauroid dinosaur from Late Cretaceous Mongolia and China. Known from partial remains, its exact relationships and lifestyle r…
Allosauroidae: the allosauroid theropods Allosauroidae Allosauroidae were a diverse clade of large theropod dinosaurs known from the Middle Jurassic to the Late Cretaceous. This article outlines their traits, history, notable genera, a…
Alvarezsaurus: a small Late Cretaceous theropod from Argentina Alvarezsaurus Alvarezsaurus is a small bipedal theropod from Upper Cretaceous Argentina (≈86–83 Ma). A basal alvarezsaur with cursorial hindlimbs, it helps document the transition to the short-a…
Ankylosauria: the armored, herbivorous dinosaurs with bony plates and tail clubs Ankylosauria Ankylosauria were heavily armored, quadrupedal herbivorous dinosaurs of Ornithischia. Known for osteoderms, tail clubs (in some), and worldwide fossil distribution from the Middle…
Ankylosauridae — armored, tail‑club dinosaurs of the Cretaceous Ankylosauridae Ankylosauridae is a family of heavily armored, quadrupedal herbivorous dinosaurs noted for osteoderms and, in many genera, a bony tail club; they lived across Laurasia and disappea…
Beibeilong — a large oviraptorosaur from China Beibeilong Beibeilong is an extinct genus of large oviraptorosaur (caenagnathid) from Cretaceous China, known from an embryo in a nest and named B. sinensis in 2017. It links giant eggs and n…
Bicentenaria: a small coelurosaurian theropod from Late Cretaceous Argentina Bicentenaria Bicentenaria is a genus of small carnivorous coelurosaurian theropods from Argentina, known from early Late Cretaceous (~90 Ma) deposits. The type species is Bicentenaria argentina…
Edmontosaurus — Late Cretaceous duck‑billed hadrosaur Edmontosaurus Edmontosaurus is a well‑known North American hadrosaur from the latest Cretaceous, noted for its broad toothless beak, massive dental batteries, frequent fossils and rare mummified…
