In Depth Mauriciosaurus is a genus of polycotylid plesiosaur known to have lived in waters of what would have been the southern portion of the Western Interior Seaway, the shallow sea that once submerged the middle portion of North America. The holotype specimen of Mauriciosaurus was found in Mexico, and has proven to be a … Read more
In Depth Initially described as a species of Plesiosaurus back in 1910, Meyerasaurus has spent a lot of time being shunted around from one genus to another before it was given its own place. First the remains were moved from Plesiosaurus to Thaumatosaurus. Then a long necked pliosaur called Rhomaleosaurus was suggested to be a … Read more
In Depth Tricleidus is but one of many cryptoclidid plesiosaurs active in European waters during the Jurassic, although it is not as well-known as the type genus of this group, Cryptoclidus. The type species name T. seeleyi is in honour of the British palaeontologist Harry Govier Seeley. Another species based upon American fossils once attributed … Read more
In Depth Formally named in 2017, Thaumatodracon was a medium sized rhomaleosaurid pliosaur. For those unfamiliar with the term, rhomaleosaurids were very similar to the long necked plesiosaurs, but with significantly larger skulls than other pliosaurs. As such, and like other rhomaleosaurids, Thaumatodracon would have been a predator of medium to large sized fish, hunting … Read more
In Depth The first specimen of Styxosaurus was of a skull and twenty cervical (neck) vertebrae, but was initially described as a species of Cimoliasaurus (C. snowii) by Samuel Wendell Williston in 1890. Williston then shifted it over as a species of Elasmosaurus in 1906 as E. snowii. Later study by Samuel Paul Welles led … Read more
In Depth Yuzhoupliosaurus was an interesting find as it was the first rhomaleosaurid pliosaur to be discovered outside of Europe. Rhomaleosaurids like Yuzhoupliosaurus were long necked pliosaurs that looked somewhere between the plesiosaurs like Plesiosaurus, and the shorter necked, large skulled forms like Simolestes and Liopleurodon. Yuzhoupliosaurus itself would have likely been a predator of … Read more
In Depth The holotype remains of Vinialesaurus were initially known as a species of Cryptoclidus when it was first described in 1949, but later study has now revealed that there is enough difference between the Vinialesaurus holotype remains of other fossils of Cryptoclidus. As a cryptoclidid plesiosaur, Vinialesaurus would have likely been one of the … Read more
In Depth The first Dolichorhynchops specimens were recovered in 1900 by George F. and Charles H. Sternberg from the Smokey Hill Chalk Formation. After being named by Samuel Wendell Williston in 1902, the type specimen has been a regular feature in the display of the Museum of Kansas. The establishment of two additional species (D. … Read more
In Depth Known from the island of Spitsbergen in Svalbard, Djupedalia seems to have been a medium sized cryptoclided plesiosaur of the late Jurassic. The partial fossil remains of Djupedalia indicate that that the holotype was a juvenile at the time of death and that it was very similar to genera such as Muraenosaurus and … Read more
In Depth Wunyelfia is a genus of elasmosaurid plesiosaur that lived in waters around South America during the late Cretaceous. Further reading - Wunyelfia maulensis gen. et sp. nov., a new basal aristonectine (Plesiosauria, Elasmosauridae) from the Upper Cretaceous of central Chile. - Cretaceous Research. 118: Article 104651. - Rodrigo A. Otero & Sergio Soto-Acu�a … Read more