Cretaceous Animals, Dinosaurs & Extinction

434Mesozoic

A coiled shell nearly two meters wide belonged to the largest known ammonite.

442Mesozoic

A giant bony fish filtered plankton near the ocean surface.

447Mesozoic

A short square snout, leaf-shaped teeth and armor belonged to a likely plant-eating crocodyliform.

453Mesozoic

A deep snout with facial ridges marked an early northern tyrannosaurid.

454Mesozoic

A relatively complete skeleton makes this giant titanosaur unusually measurable.

455Mesozoic

Paired neck-vertebra spines curve forward; a described pair measures 58 cm.

458Mesozoic

It hunted through polar night, though its supposedly dwarf size remains uncertain.

495Mesozoic

A long snout, conical teeth and low crest belonged to a spinosaurid that frequently ate fish.

535Mesozoic

Long three-fingered arms and a light body preceded the giant two-fingered tyrannosaurs.

536Mesozoic

This giant carcharodontosaurid shared plains with enormous sauropods and is known from a multi-individual bone bed.

537Mesozoic

Heavy skull armor, neck rings and a tail club belonged to a large Gobi ankylosaur.

538Mesozoic

Short legs, a broad trunk and giant thumb spike made an unusually low heavy iguanodontian.

553Mesozoic

Tough pinnate leaves crowned cycad-like trunks around compact flower-like reproductive organs.

564Mesozoic

Long hind limbs and a lightly built skeleton indicate a large, fast-moving theropod.