Planicoxa: Research Database Iguanodontia (Ornithischia) · Early Cretaceous (~130-125 MYA) · North America — USA, South Dakota (Lakota Formation) Research Note: Planicoxa was an iguanodontian ornithischian from the Early Cretaceous of South Dakota — an important taxon for understanding iguanodontian diversity and evolution in the Early Cretaceous of North America. Research Finding Status … Read more
In Depth Zuoyunlong is a genus of hadrosauroid dinosaur that lived in China during the early stages of the late Cretaceous. In terms of physical development, hadrosauroid dinosaurs were in between the earlier iguanodonts of the late Jurassic and early Cretaceous, and the later hadrosaurids that were most common by the end of the late … Read more
In Depth At times the skull of Naashoibitosaurus has been attributed to Kritosaurus, while the post cranial skeleton attributed to Edmontosaurus. This is because the skull has been challenged as representing a growth stage of Kritosaurus, though other studies have shown that it is different enough to be regarded as its own genus. Currently however, … Read more
In Depth Protohadros is a genus of medium to large ornithopod dinosaur that lived in North America during the late Cretaceous. Protohadros means ‘first hadrosaur)’, and reflects the idea at the time of its description that the genus may represent the earliest true hadrosaur in North America. However, since Protohadros has been named, several new … Read more
In Depth Sahaliyania was discovered and described along with another new hadrosaurid dinosaur called Wulagasaurus, however this one appears to have been a saurolophine hadrosaurid, whereas Sahaliyania is more clearly defined as a lambeosaurine hadrosaurid. Initially based upon the description of a partial skull, further fossil remains have since been attributed to Sahaliyania. Aside from … Read more
Fukuisaurus: Research Database Ornithischia (Dinosauria) · Early Cretaceous (~120-115 MYA) · Asia — Japan (Fukuoka Prefecture, Kitadani Formation) Research Note: Fukuisaurus was an ornithischian dinosaur from the Early Cretaceous of Japan — one of the few known dinosaurs from Japan and an important taxon for understanding ornithischian diversity and biogeography in the Cretaceous of … Read more
In Depth The name Prosaurolophus was decided for this genus of hadrosaurid dinosaur on the basis that it was believed to have been similar to but lived before another genus called Saurolophus. However, this interpretation is now somewhat more controversial with different palaeontologists citing Prosaurolophus as being more closely related to other varying genera other … Read more
In Depth The holotype fossils of Altirhinus were originally classified as a species of Iguanodon, I. orientalis back in 1952. However Iguanodon has long suffered from the wastebasket taxon effect where remains of superficially similar dinosaurs have been attributed to the genus, in part due to its long history and seemingly wide distribution of fossils … Read more