▁a ▁sl ender ▁sh aft . ▁ ▁So ft ▁t issues ▁▁ ▁The ▁hol ot ype ▁pres erves ▁an ▁exception ally ▁large ▁set ▁of ▁soft ▁t issues ▁for ▁a ▁foss il ▁din osa ur . ▁Although ▁some ▁mus cle ▁t issue ▁( S ant an ar apt or , ▁Pe le can im im us ), ▁cart il age ▁( J ur aven ator , ▁A uc as aur us ) ▁or ▁an ▁int est ine ▁( M ir isch ia ) ▁have ▁been ▁reported ▁from ▁other ▁din osa urs , ▁Sci p iony x ▁is ▁unique ▁in ▁pres erving ▁in ▁some ▁form ▁examples ▁from ▁most ▁major ▁internal ▁organ ▁groups : ▁blood , ▁blood ▁vessels , ▁cart il age , ▁connect ive ▁t issues , ▁b one ▁t issue , ▁mus cle ▁t issue , ▁horn ▁she ath s , ▁the ▁resp ir atory ▁system ▁and ▁the ▁dig est ive ▁system . ▁N erv ous ▁t issue ▁and ▁the ▁external ▁skin , ▁including ▁possible ▁scales ▁or ▁fe athers , ▁are ▁absent . ▁ ▁The ▁soft ▁t issues ▁are ▁not ▁present ▁in ▁the ▁form ▁of ▁im print s ▁but ▁as ▁three - dimensional ▁pet r ifications , ▁having ▁been ▁replaced ▁by ▁calci um ▁ph osph ate ▁in ▁amaz ing ▁detail , ▁even ▁to ▁the ▁sub cell ular ▁level ; ▁or ▁as ▁transformed ▁remains ▁of ▁the ▁original ▁bi om ole cular ▁components . ▁ ▁B one ▁t issue ▁The ▁original ▁b one ▁t issue ▁is ▁no ▁longer ▁present ▁but ▁the ▁calci um ▁ph osph ate