Question 1

How do you say Plesiotylosaurus?

Accepted Answer

You say it like this: PLEE-see-oh-TY-loh-SOR-us. Break it into five chunks and say each one slowly at first. The trick is putting the stress on the second and fourth syllables, TY and SOR. Once you get the rhythm, it flows surprisingly well for such a long name.

Question 2

What does Plesiotylosaurus mean?

Accepted Answer

The name means near Tylosaurus lizard. The plesio part comes from the Greek word plesios meaning near or close to, and it was chosen because the fossil looked similar to another famous sea lizard called Tylosaurus. The saurus part at the end just means lizard in Greek, which you will find on the end of almost every dinosaur and prehistoric reptile name.

Question 3

Was Plesiotylosaurus a dinosaur?

Accepted Answer

No, Plesiotylosaurus was not a dinosaur at all. It was a mosasaur, which means it was actually more closely related to modern monitor lizards and snakes than to any dinosaur. Mosasaurs evolved from land-dwelling lizard ancestors and gradually adapted to a fully aquatic life in the ocean. They are one of the most amazing examples of evolutionary transformation in the entire fossil record.

Question 4

How big was Plesiotylosaurus?

Accepted Answer

Plesiotylosaurus was a genuinely large predator, estimated at around 20 to 30 feet long, which is roughly the length of a school bus. It likely weighed somewhere between 2,000 and 4,000 pounds. That puts it in the same size category as some of the biggest mosasaurs, though giants like Mosasaurus could push even larger sizes.

Question 5

What did Plesiotylosaurus eat?

Accepted Answer

Plesiotylosaurus was a carnivore, and its thick heavy teeth give us an important clue about its diet. The species name crassidens literally means thick teeth, and teeth like that are built for crushing rather than just slicing flesh. Scientists think it may have eaten hard-shelled prey like ammonites, sea turtles, or large bony fish, which would have set it apart from other mosasaurs with sharper, slicing teeth.

Question 6

Where did Plesiotylosaurus live?

Accepted Answer

All known Plesiotylosaurus fossils come from the Moreno Formation in California, making it one of the few mosasaurs known only from the western United States. During the Late Cretaceous period, a warm shallow sea covered much of what is now California's Central Valley and coastal regions. Plesiotylosaurus patrolled those waters about 66 million years ago during the final chapter of the age of dinosaurs.

Question 7

When did Plesiotylosaurus go extinct?

Accepted Answer

Plesiotylosaurus lived during the Middle Maastrichtian age, roughly 66 million years ago, placing it right at the very end of the Cretaceous period. Like all mosasaurs, it was wiped out in the same mass extinction event that killed the non-avian dinosaurs. This extinction was almost certainly caused or heavily triggered by the Chicxulub asteroid impact, which ended the reign of nearly every large animal on the planet.

Question 8

Who discovered Plesiotylosaurus?

Accepted Answer

Plesiotylosaurus was described by American paleontologist Charles Lewis Camp in 1942. Camp was a prolific paleontologist who worked extensively on Triassic and Cretaceous fossils from the American West. The fossils he described came from the Moreno Formation in California, and his 1942 paper established Plesiotylosaurus crassidens as a new genus and species of mosasaur.

Plesiotylosaurus Pronunciation

Plesiotylosaurus Picture

What does Plesiotylosaurus mean?

Name Roots

Fun Facts

Learn More About Plesiotylosaurus

Related Prehistoric Creatures