Protoceratopsidae A clade in the dinosaur family tree. The entries below are classified within it. Breviceratops kozlowskii 100–66 Mya · Mongolia Gobiceratops 83.6–72.2 Mya Lamaceratops tereschenkoi 83.6–72.2 Mya Magnirostris 83.6–72.2 Mya Platyceratops 83.6–66 Mya Bainoceratops efremovi 75–71 Mya · Mongolia Bagaceratops rozhdestvenskyi 72–71 Mya · Asia