How did aquatic dinosaurs go extinct? Dominant theory is that 'normal' dinosaurs went extinct from ether super volcano or meteor impact or combination of both. However there were aquatic dinosaurs that are not present at this day. Was it one of the events above that caused them to go extinct, or was it something else? **How did aquatic dinosaurs go extinct?**

Spinosaurs (like _Spinosaurus_ ) are currently only known from 112-97 million years ago, although isolated teeth push the origin possibly back to ~150 Mya. At least now, there isn't any definite spinosaur material younger than 97 Mya.

So spinosaurs were already extinct when the rest of the non-bird dinosaurs went extinct at the end of the Cretaceous, whether by meteor impact, volcanism, a combination, or something else completely.