The Chasmosaurus is one of the rarest of all the Dino-Riders pieces. Like the other 3rd Series dinosaurs, this piece only had a very limited release, predominately in the western United States and Europe. The Chasmosaurus uses the exact same body as the Styracosaurus and Monoclonius. However, the piece had a new head mold and the paint scheme was much more colorful and represented a significant departure from previous paint schemes in the line. The tail and the head were connected in such a way that if you moved the tail in one direction, the head would swing in the other direction.