Once known as Microceratops, “small-horned face,” was a fittingly small ceratopsian described by Birger Bohlin in 1953. Microceratus (“small-horned”) lived in what is now the Gobi Desert from approximately 80 to 65 million years ago, during the Late Cretaceous. This animal’s name is well-deserved: at only 2 ft (0.6 m) in length, 10 inches (25 cm) in height, and approximately 15 lbs (6.8 kg) in weight, it was positively tiny.
In the first edition of Jurassic Park, the dinosaur Callovosaurus was listed on the tally screen. However, after Callovosaurus was reclassified as Camptosaurus, subsequent editions listed Microceratops (Microceratus) instead. However, in both versions, Callovosaurus was never encountered while Microceratops was. On Isla Nublar, they were seen in the trees above the river by Alan Grant, Tim and Lex Murphy.
Of note is speculation that Callovosaurus may not be Camptosaurus, and may instead be a type of dryosaur.