▁For ▁the ▁species , ▁it ▁was ▁chosen ▁to ▁honour ▁Yang ▁Zh ong j ian , ▁the ▁father ▁and ▁founder ▁of ▁all ▁Chinese ▁pale ont ology , ▁who ▁was ▁well ▁known ▁for ▁his ▁work ▁on ▁" pro s au rop ods ", ▁and ▁called ▁in ▁English ▁C . C . ▁Young . ▁Of ▁the ▁two ▁spec im ens , ▁the ▁hol ot ype ▁was ▁chosen , ▁known ▁from ▁a ▁more ▁complete ▁sk ull . ▁The ▁hol ot ype , ▁Y XV ▁ 8 7 0 1 , ▁is ▁known ▁from ▁a ▁complete ▁sk ull ▁and ▁mand ible ▁only ▁lack ing ▁the ▁anterior ▁end ▁of ▁the ▁j aw ▁and ▁minor ▁fragments ▁of ▁b one ▁around ▁the ▁orbit , ▁as ▁well ▁as ▁the ▁post c ran ial ▁elements ▁of ▁fragment ary ▁cer v ical ▁and ▁d ors al ▁verte bra e , ▁all ▁sac ral ▁verte bra e , ▁an ▁il ium , ▁both ▁is chia , ▁a ▁complete ▁fem ur , ▁and ▁incomplete ▁and ▁dam aged ▁rib s . ▁Y XV 8 7 0 2 , ▁the ▁par atype , ▁is ▁known ▁from ▁an ▁only ▁incomplete ▁sk ull , ▁many ▁cer v ical ▁and ▁d ors al ▁verte bra e , ▁three ▁sacr als , ▁a ▁few ▁ca ud al ▁verte bra e , ▁a ▁sc ap ula - cor ac oid , ▁an ▁entire ▁pel vis , ▁and ▁almost ▁both ▁entire ▁h ind lim bs . ▁ ▁References ▁ ▁External ▁links ▁Din osa uria ▁ ▁Category : E ar ly ▁Jur ass ic ▁din