General
Ichthyosaurs
Sauropterygians
Mosasaurs
Other
100

The most common diets of marine reptiles.

What is carnivorous and/or piscivorous? 

100

A modern animal very similar to Ichthyosaurs ecologically that they’re often compared to despite sharing no close relation evolutionarily.

What is dolphins?

100

The three main groups the Sauropterygia is separated into.

What is Plesiosauria, Nothosauria, and Placodontia?

100

The diet of a Mosasaur.

What is anything that would fit on their mouths?

100

The way Thalattosaurs would move through the water.

What is undulating and using their tails for propulsion?

200

Three traits that evolved independently in many marine reptile lineages.

What is live birth, flippers, tail fin/fluke, smooth skin, etc.

200

Two traits Ichthyosaurs had. 

What is short neck, smooth scale-less skin, blubber, tail fin, flippers, dorsal fin, pointy jaws with conical or bladed teeth, large eyes, etc.?

200

The time that the first Plesiosauroid was discovered.

What is 1844?

200

The group of modern animals Mosasaurs are closest to evolutionarily.

What is monitor lizards?

200

The only linage of marine crocodilians.

What is Thalattosuchia?

300

The approximate length of the largest Ichthyosaurs.

What is ~85 feet?

300

The two main groups the Plesiosauria is separated into.

What is Plesiosauroidea and Pliosauroidea?

300

The time period Mosasaurs were alive during.

What is Cretaceous?

300

A group of marine reptiles that prowled the coasts of Asia and North America during the Triassic. They left no modern decedents. 

What is Thalattosauria?

400

The extinction event that caused the Ichthyosaurs to go extinct.

What is the Late Cretaceous oceanic anoxia event?

400

The period Nothosaurs and Placodonts lived during.

What is Triassic?

400

The extinction event that wiped out the Mosasaurs.

What is the End Cretaceous Mass Extinction (the asteroid)?

400

The lineage of marine turtles that was alive during the mesozoic.

What is Protostegidae?

500

One genus of Ichthyosaur.

What is Shonisaurus, Ichthyosaurus, Mixosaurus, etc.?

500

The largest Pliosaur genus.

What is Kronosaurus?

500

The geographical range of Mosasaurs.

What is the shallow waters of North and South America?

500

The only lineage of marine Archosauromorph that were alive during the Triassic.

What is Tanysauria?