Board Thread:Movie discussion/@comment-25155524-20140709013547/@comment-1259419-20140710182232

While Tylosaurus is a Mosasaur, it is not a species under the Mosasaurus genus.

....I know. So, yeah, technically it is a Mosasaur. But Universal isn't really consistent with scientific names. That is why they write "T-Rex" everywhere. In JP:TG the Tylosaurus is called a "Mosasaurus" MANY times. So, the fact that it says "Mosasaurus" on the map doesn't prove that they mean the genus.