▁the ▁hand ▁cla ws ▁extend ▁the ▁b ony ▁cores ▁by ▁about ▁ 4 0 %, ▁sc y the - like ▁continu ing ▁the ▁b one ▁curve ▁and ▁ending ▁in ▁sharp ▁points . ▁On ▁some ▁cla ws ▁the ▁she ath s ▁have ▁partly ▁det ached ; ▁on ▁others ▁they ▁have ▁been ▁fl atten ed ▁or ▁split . ▁ ▁In te g ument ▁ ▁The ▁foss il ▁pres erves ▁no ▁traces ▁of ▁any ▁skin , ▁scales ▁or ▁fe athers . ▁In ▁ 1 9 9 9 ▁Philip ▁J . ▁C urr ie ▁hypoth es ised ▁this ▁might ▁be ▁otherwise , ▁suggesting ▁the ▁tub es ▁found ▁on ▁the ▁tail ▁base ▁would ▁represent ▁the ▁fil aments ▁of ▁proto fe athers . ▁In ▁ 2 0 1 1 , ▁however , ▁Dal ▁S asso ▁& ▁Mag anu co ▁rejected ▁this ▁interpretation ▁because ▁the ▁tub es ▁t aper ▁at ▁both ▁ends , ▁while ▁inte g ument ▁fil aments ▁are ▁expected ▁to ▁have ▁only ▁a ▁t aper ed ▁top ▁end . ▁Nevertheless , ▁they ▁considered ▁it ▁likely ▁that ▁Sci p iony x ▁in ▁life ▁had ▁proto fe athers ▁as ▁these ▁are ▁known ▁to ▁be ▁present ▁with ▁the ▁com ps ogn ath ids ▁S inos au rop tery x ▁and ▁Sin ocal li opter y x . ▁ ▁Ph y log eny ▁Sci p iony x ▁was ▁by ▁the ▁descri bers ▁assigned ▁to ▁the ▁Co el u ros aur ia , ▁a ▁group ▁of ▁ther op ods . ▁Because ▁the ▁only ▁remains ▁recovered ▁belong ▁to ▁that ▁of ▁a ▁ju ven ile