Almost all Basal - Ceratopsians except `` Yinlong '' and perhaps the Chaoyangsauridae were known . Psittacosaurids were known to almost all basal ceratopsians except `` Yinlong '' and perhaps the Chaoyangsauridae .
Hampir kesemua Basal-Seratopsians kecuali "Yinlong"' dan mungkin Chaoyangsauridae diketahui. Psittacosaurids dikenali hampir semua ceratopsians basal kecuali "Yinlong"' dan mungkin Chaoyangsauridae.