In Depth Bicentenaria is an interesting theropod whose remains were recovered from the Ezequiel Ramos Mexia Reservoir, Rio Negro Province, Argentina by Raul Spedale in 1998. The remains were of a concentration of disarticulated remains of many individuals, but their similarity to one another strongly suggests that they were all from the same genus of … Read more
In Depth Though first described from a partial maxilla, the mosasaur Xenodens seems to have had very specialised teeth. These teeth are individually short and flattened into stout blade-like form, but when in the jaw, are tightly packed together to form what can only be described as a saw blade-like structure. Indeed, the type species … Read more
In Depth Dromomeron is a genus of small dinosauromorph that lived in North America during the late Triassic. Since being first described in 2007, the recovery and study of Dromomeron fossils in the south west of the USA has revealed an interesting discovery. Though only known from the partial remains of a few individuals, these … Read more
In Depth Guaibasaurus is known from fairly good remains, though the skull is unknown. When first described, Guaibasaurus was considered to be a potential theropod dinosaur, though later a similarity with the primitive sauropodomorph dinosaur Saturnalia was noted, and now Guaibasaurus is usually seen as a very primitive sauropodomorph dinosaur. Further Reading - A new … Read more
In Depth First discovered in 2009, the holotype specimen of Cryopterygius was found quite complete, only the posterior portion of the tail is missing. The main length of Cryopterygius from the tip of the snout to the posterior regions of the body is just over four and a half meters long, Depending upon how long … Read more
In Depth Usually seen as a nothosaur, Simosaurus was a marine reptile that lived in European waters during the Triassic. The teeth of Simosaurus are quite blunt and while the jaws of Simosaurus are quite gracile, the way the muscles attached show that they could be closed very quickly. It is possible that Simosaurus used … Read more
In Depth Heterodontosaurus is one of more popular ornithischian genera thanks to the mixture of teeth in the mouth. Heterodontosaurus had blade-like incisor teeth and chisel-like molar teeth within the mouth for processing food by slicing and grinding respectively. The show stealing features of the mouth however are the large tusks in the anterior (front) … Read more
In Depth Vectaerovenator is a genus of theropod dinosaur that lived during the early cretaceous. Because the only fossil known for Vectaerovenator at the time of its description only consist of a few vertebrae, there is much we do not know about this dinosaur, including what kind of theropod dinosaur it was. Since the naming … Read more
In Depth Tianzhenosaurus is a genus of relatively small ankylosaurid dinosaur that lived in China during the late Cretaceous, though a specific point of time during the late Cretaceous is unavailable at the time of writing. There has however been speculation that Tianzhenosaurus may actually be synonymous with the genus Saichania. Further Reading - A … Read more
In Depth Sumpalla ia a genus of ichthyosaur that lived in the waters around South America during the late Jurassic. The holotype fossil of Sumpalla was originally assigned to the Aegirosaurus genus, before being re-described in 2021. Further reading - Morphological disparity in the evolution of the ophthalmosaurid forefin: new clues from the Upper Jurassic … Read more