Biawakasaurus. A made-up creature that looks like a cross between a monitor lizard and a crocodile with huge eyes.
Pausauron. Made up creature resembling a Basilosaurus.
The only made-up creatures are the three, horned and spiky animals. The rest are real animals; Lancetfish, Helicoprion, Ammonite, Leafy Sea Dragon, Frilled Shark, and Gulper Eel.
All three are real animals of the prehistoric. From top to bottom; Anomalocaris, Dunkleosteus, and Therizinosaurus.