Species Classification: ‭ ‬Russellosaurinae.

In Depth        Tethysaurus is a primitive‭ (‬basal‭) ‬mosasaur that is considered to be related to Russelosaurus from North America and Yaguarasaurus from South America.‭ ‬Like these other two mosasaurs,‭ ‬Tethysaurus has a mixture of both primitive and advanced features that make it‭ ‬a‭ ‬primitive relative to other later mosasaur groups,‭ ‬although not as primitive as … Read more

In Depth        Russellosaurus represents a primitive mosasaur,‭ ‬marine reptiles that would go on to achieve a variety of sizes and specialisations that would see them becoming the dominant predators of the late Cretaceous seas.‭ ‬Russelosaurus itself displays a number of features which are diagnostic of more than one mosasaur group,‭ ‬something that suggests that these … Read more