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Gordon Bell and Mike Caldwell rediscovered the mosasaur snout fragment discovered by Harlan. Using photographs of the Goldfuss mosasaur skull by Takehito Ikejiri they were able to verify that the specimens did in fact come from the same individual. [144] 2005. Polcyn and Bell described the new genus and species Russellosaurus coheni. [145]
The smaller mosasaurs may have spent some time in fresh water, hunting for food. The largest mosasaur Mosasaurus hoffmannii was the apex predator of the Late Cretaceous oceans, reaching more than 11 metres (36 ft) in length and weighing up to 10 metric tons (11 short tons) in body mass. [14]
His findings remained largely ignored until more complete North American mosasaur fossils were discovered during the 1870s. Historically, the type species M. hoffmannii was described via unclear diagnosis, leading the genus to become a wastebasket taxon containing up to fifty different species.
Mosasaurus (/ ˌ m oʊ z ə ˈ s ɔːr ə s /; "lizard of the Meuse River") is the type genus (defining example) of the mosasaurs, an extinct group of aquatic squamate reptiles.It lived from about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous.
Mosasaurini is an extinct tribe of mosasaurine mosasaurs who lived during the Late Cretaceous and whose fossils have been found in North America, South America, Europe, Africa and Oceania, with questionable occurrences in Asia.
Mosasauroidea is a superfamily of extinct marine lizards that existed during the Late Cretaceous.Basal members of this group consist of small semiaquatic forms with terrestrial limbs ("plesiopedal"), while laters members include larger fully aquatic paddle-limbed ("hydropedal") forms commonly known as mosasaurs. [3]
Skeleton of Clidastes liodontus mounted as if pursuing a fossil sea turtle. Russell (1967, pp. 123–124) [6] defined the Mosasaurinae as differing from all other mosasaurs as follows: "Small rostrum present or absent anterior to premaxillary teeth.
Thalassotitan is one of the largest known mosasaurs, having an estimated size of around 9 to 10 m (30 to 33 ft) long. This genus shows definitely that mosasaurs evolved to take over the apex predator niche in the oceans of the Late Cretaceous which is now filled by sharks and orcas.
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