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 .
Psittacosaurids adalah basal kepada hampir semua ceratopsians yang diketahui kecuali "Yinlong"' dan mungkin Chaoyangsauridae. Psittacosaurides adalah basal kepada hampir semua Ceratopsians yang dikenali kecuali "Yinlong"' dan mungkin Chaoyangsauridae.