Psittacosaurids were basal to almost all known ceratopsians except " Yinlong " and perhaps the Chaoyangsauridae .
Psittacosaurides were basal to almost all known Ceratopsians except " Yinlong " and perhaps the Chaoyangsauridae .
Psittacosaurides were basal to almost all known Ceratopsians except " Yinlong " and perhaps the Chaoyangsauridae .
문장을 의역 버전으로 작성하세요: Psittacosaurids were basal to almost all known ceratopsians except " Yinlong " and perhaps the Chaoyangsauridae . 산출: