urus , ▁ther op ods ▁of ▁considerable ▁magnitude . ▁However , ▁given ▁its ▁aff in ities ▁with ▁the ▁Com ps ogn ath idae , ▁it ▁is ▁likely ▁that ▁the ▁adult ▁size ▁of ▁Sci p iony x ▁did ▁not ▁sur pass ▁that ▁of ▁the ▁largest ▁known ▁com ps ogn ath id , ▁Sin ocal li opter y x ▁of ▁ 2 3 7 ▁cent imet res ▁length . ▁As ▁the ▁h atch ling ▁would ▁have ▁fitted ▁within ▁an ▁egg ▁about ▁eleven ▁cent imet res ▁long ▁and ▁six ▁cent imet res ▁wide , ▁this ▁would ▁have ▁imp lied ▁a ▁rather ▁high ▁egg ▁size ▁compared ▁to ▁the ▁adult ▁body ▁length . ▁ ▁General ▁build ▁▁ ▁Because ▁the ▁hol ot ype ▁is ▁a ▁h atch ling ▁of ▁perhaps ▁only ▁a ▁few ▁days ▁old , ▁it ▁is ▁hard ▁to ▁determine ▁the ▁build ▁of ▁the ▁adult ▁animal ▁but ▁some ▁general ▁conclus ions ▁can ▁be ▁reli ably ▁made . ▁Sci p iony x ▁was ▁a ▁small ▁b ip ed al ▁pred ator . ▁Its ▁horizontal ▁r ump ▁was ▁bal anced ▁by ▁a ▁long ▁tail . ▁The ▁neck ▁was ▁relatively ▁long ▁and ▁sl ender . ▁The ▁h ind lim bs ▁and ▁especially ▁the ▁for el im bs ▁were ▁rather ▁el ong ated . ▁Dal ▁S asso ▁& ▁Mag anu co ▁considered ▁it ▁likely ▁that ▁a ▁coat ▁of ▁primitive ▁proto fe athers ▁was ▁present , ▁as ▁these ▁are ▁also ▁known ▁from ▁some ▁direct ▁relatives . ▁ ▁Di agnostic ▁tra its ▁The ▁ 2 0 1 1 ▁study ▁established ▁eight ▁unique ▁derived ▁tra