Clidastes is a mosasaur, a carnivorous sea reptile. It is unique because it was the one of the smallest of the mosasaurs (the smallest being Dallasaurus), averaging 2–4 meters (6.6–13.1 feet) in length, with the largest specimens reaching 6.2 meters (20 feet) long. Clidastes was an agile swimmer that probably swam by undulating its tail, and preyed on cephalopods, fish and other small vertebrates in shallow water.
Clidastes appears in Jurassic Park III: Park Builder. It never appears in the other games, films, or novels.