In Depth First named in 1996, Siamotyrannus was originally thought to represent one of the earliest known occurrences of a large tyrannosaur, hence the name Siamotyrannus which combines the old name for Thailand, Siam, with the ancient Greek for tyrant. However later studies of Siamotyrannus have come to the conclusion that Siamotyrannus was not a … Read more
Tochisaurus: Research Database Troodontidae (Theropoda) · Late Cretaceous (~70 MYA) ·> Asia — Mongolia (Nemegt Formation) Research Note: Tochisaurus was a troodontid theropod from the Late Cretaceous Nemegt Formation of Mongolia. As a member of Troodontidae, it provides important data on small theropod diversity and the evolution of bird-like features in theropods. Research … Read more
Bonapartenykus: Research Database Alvarezsauridae (Theropoda) · Late Cretaceous (~83–70 MYA) · South America — Argentina, Patagonia (Lechoja Formation) Research Note: Bonapartenykus was an alvarezsaurid theropod from the Late Cretaceous Lechoja Formation of Patagonia, Argentina. As a South American alvarezsaurid, it provides important data on alvarezsaurid diversity and distribution in Gondwana. Research Finding Status … Read more
In Depth Zhejiangosaurus is not completely known, nor does it seem to show any special features beyond being a nodosaurid. This identification is itself important however since the only two other Asian nodosaurids named before this, Zhongyuansaurus and Liaoningosaurus, have now been re-classified as ankylosaurids. At the time of its description this makes Zhejiangosaurus the … Read more
Leptoceratops: Research Database Ceratopsia (Ornithischia) · Late Cretaceous (~70-67 MYA) · North America — Canada, Alberta (Maastrichtian) Research Note: Leptoceratops was a primitive ceratopsian from the Late Cretaceous of North America — one of the few known ceratopsians outside of Asia in the Late Cretaceous. As a member of the Ceratopsia, it provides data … Read more
Bonitasaura: Research Database Titanosauria (Sauropoda) · Late Cretaceous (~83–71 MYA) · South America — Argentina (Cerro del Pueblo Formation) Research Note: Bonitasaura salgadoi was a titanosaurian sauropod from the Late Cretaceous Cerro del Pueblo Formation of Argentina. It is characterised by its relatively small body size and provides data on titanosaur diversity in Late … Read more
Equijubus: Research Database Hadrosauroidea (Ornithischia) · Early Cretaceous (~100 MYA) · Asia — China (Gansu, Xiagou Formation) Research Note: Equijubus was a hadrosauroid from the Early Cretaceous Xiagou Formation of Gansu, China. As one of the earliest known hadrosauroids, it provides important data on the early evolution and diversification of hadrosauroid dinosaurs in the … Read more
Kerberosaurus: Research Database Ornithischia · Cretaceous · North America Research Note: Kerberosaurus was a hadrosaurid from the Cretaceous of North America, providing important data on ornithischian diversity in the Cretaceous. Research Finding Status Grade Year Method Citation Impact Gates & Farke 2009: Kerberosaurus and hadrosaurid diversity in the Cretaceous Cretaceous Research Confirmed A … Read more
Zuul: Research Database Ankylosauridae (Dinosauria) · Late Cretaceous (~68-66 MYA) · North America — Montana (Hell Creek Formation) Research Note: Zuul was an ankylosaurid from the Late Cretaceous of Montana — a well-preserved armored dinosaur and an important taxon for understanding ankylosaurid evolution in the Late Cretaceous of North America. Research Finding Status … Read more
Huayangosaurus: Research Database Stegosauridae (Ornithischia) · Middle Jurassic (~170 MYA) · Asia — China (Xiashaximiao Formation, Sichuan) Research Note: Huayangosaurus was a stegosaurid from the Middle Jurassic of Sichuan, China — older than the famous Late Jurassic stegosaurs like Stegosaurus and Kentrosaurus, and representing an earlier stage in stegosaur evolution. Its discovery from the … Read more