One of a pair of rear, lower hipbones, rodlike in dinosaurs. The ischium anchored hind-limb muscles that pulled the leg in and back. Menu Jugal A bone below the eye. In ceratopsians it formed a flaring cheekbone. Maniraptorans Small coelurosaurian theropods with a distinctive wrist design.
Many scientists think maniraptorans gave rise to birds.
The upper jaw, and, in particular, one of its pair of main tooth-bearing bones. Pachycephalosaurs Bipedal marginocephalians with an immensely thick skull. Predentary A toothless bone located at the tip of the lower jaw of ornithischians. One of a pair of front, lower pelvic bones, rodlike in dinosaurs. Some pubes had a long, forward extension, or prepubis.