This is correct.Dinosaurs are no longer found under a "Dinosaur" monster entry. Two places I can think of:
1. Drakes: The needlefang drake swarm (MM1) makes a good group of small meat-eaters. The guard drake (MM1) and bloodseeker drake (MM2) are more man-sized meat-eaters. The scytheclaw drake (MM2) is a velociraptor, while the fang titan drake (MM2) is a tyrannosaur.
2. Behemoth: The macetail behemoth (MM1) is an ankylosaur, while the bloodspike behemoth (MM2) is a stegosaur.