Apatosaurus: Research Database Diplodocidae · Late Jurassic (~152-151 MYA) · Morrison Formation, Western USA Research Note: Apatosaurus is one of the most iconic sauropods, famous for its great size and long neck. It was one of the first sauropods described in North America. The type species is A. louisae, known from a nearly complete specimen. … Read more
Abrictosaurus: Research Database Heterodontosauridae (Ornithischia) · Early Jurassic (~200–190 MYA) · Africa — Lesotho (Elliot Formation) Research Note: Abrictosaurus was a heterodontosaurid ornithischian from the Early Jurassic of Lesotho, southern Africa. As one of the earliest known ornithischian dinosaurs, it provides critical data on the early diversification of this major dinosaur group. Research … Read more
In Depth Agathaumas has been envisioned as a very large ceratopsian dinosaur, potentially as much as ten meters long, that lived in what is now the USA near the end of the Cretaceous period. However most palaeontologists agree that Agathaumas is a highly dubious genus of ceratopsian since it was based upon the description of … Read more
Akainacephalus: Research Database Ankylosauridae (Ornithischia) · Late Cretaceous (~76 MYA) ·> North America — USA (Wahweap Formation, Utah) Research Note: Akainacephalus was an ankylosaurid from the Late Cretaceous Wahweap Formation of Utah. As a member of Ankylosauridae, it provides important data on armored dinosaur diversity and evolution in the Late Cretaceous of North America. … Read more
Aeolosaurus: Research Database Titanosauria (Sauropoda) · Late Cretaceous (~70-66 MYA) · South America — Argentina (Allen Formation, Anacleto Formation) Research Note: Aeolosaurus was a titanosaurian sauropod from the Late Cretaceous of Argentina — one of the most complete known titanosaurs and an important taxon for understanding titanosaur anatomy, systematics, and diversity in the Cretaceous … Read more
Archaeoceratops: Research Database Ceratopsia (Ornithischia) · Early Cretaceous (~130–120 MYA) · Asia — China (Liaoning) Research Note: Archaeoceratops was a basal ceratopsian dinosaur from the Early Cretaceous of Liaoning, China. As one of the earliest known ceratopsians, it provides critical data on the early evolution of the ceratopsian body plan. Research Finding Status … Read more
In Depth Aegyptosaurus was a mid-sized sauropod dinosaur that is known to have lived in what is now Egypt from both sides of the early/late Cretaceous boundary. Unfortunately we only have the original descriptions of this dinosaur for study as the original fossils were destroyed along with the Munich museum during an allied bombing raid … Read more
In Depth Aquilarhinus named for the perceived appearance of the snout which in life is thought to resemble the hooked bend of an eagles beak, suggesting Aquilarhinus may have had a specialised feeding method. Study of the lower jaw has led to a postulated reconstruction of front of the jaws having a rounded shovel-like structure. … Read more
Apatoraptor: Research Database Reptilia (Theropoda) · Late Cretaceous (~70 MYA) · North America — USA, Montana Research Note: Apatoraptor was a theropod dinosaur from the Late Cretaceous of Montana — significant for understanding theropod diversity and ecology in North America during the latest Cretaceous. Research Finding Status Grade Year Method Citation Impact Lockley … Read more
In Depth Ammosaurus has a long taxonomic relationship with Anchisaurus. The holotype fossils of Ammosaurus were originally described as a large species of Anchisaurus by Othniel Charles Marsh before they were erected as a distinct genus. Marsh then named a new species of Anchisaurus, A. solus, but then attributed that to Ammosaurus. Later palaeontologists found … Read more