Ontogenetic stages of ceratopsian dinosaur Psittacosaurus in bone histology
The early ceratopsians Psittacosaurus and Protoceratops have provided important information on dinosaurian development because of abundant specimens of adults, subadults, juveniles, and even hatchlings.Here we present new #10 Star Washer data and methods for identifying key growth stages from bone histology.Previous studies on Psittacosaurus lujiat