▁shape . ▁ ▁Thor atic ▁sc utes ▁on ▁str uth ios aur ines ▁are ▁o val ▁to ▁te ard rop ▁sh aped , ▁and ▁possess ▁sharp ▁rid ges ▁that ▁rise ▁dist ally . ▁Some ▁sc utes ▁were ▁long ▁and ▁had ▁small ▁dom es ▁on ▁them . ▁The ▁first ▁primary ▁o ste od erm s ▁on ▁the ▁pel vis ▁are ▁large , ▁com pressed ▁from ▁the ▁sides , ▁and ▁have ▁a ▁sharp , ▁short ▁point . ▁S . ▁sp . ▁was ▁preserved ▁with ▁five ▁fragment ary ▁sc utes ▁from ▁the ▁pel vis . ▁One ▁fragment ▁includes ▁two ▁small ▁sc utes ▁with ▁a ▁r idge ▁down ▁the ▁middle , ▁joining ▁the ▁two ▁together , ▁and ▁a ▁com pressed ▁o ste od erm ▁with ▁a ▁small ▁sp ike . ▁It ▁is ▁thought ▁that ▁the ▁fragment ▁was ▁from ▁the ▁edge ▁of ▁the ▁pel vic ▁region . ▁Another ▁fragment ▁includes ▁two ▁o val ▁o ste od erm s ▁with ▁small ▁o ss icles ▁f used ▁between ▁them . ▁Pel vic ▁shield s ▁were ▁probably ▁formed ▁on ▁str uth ios aur ines ▁by ▁these ▁sc utes . ▁ ▁Ca ud al ▁sc utes ▁have ▁been ▁preserved ▁on ▁str uth ios aur ines . ▁The ▁o ste od erm s ▁are ▁com pressed ▁in wards ▁from ▁the ▁side , ▁have ▁a ▁slope ▁position ed ▁anterior ly , ▁and ▁a ▁square - sh aped ▁posterior ▁edge . ▁ ▁Dist ingu ishing ▁an atom ical ▁features ▁All ▁an k yl osa urs ▁that ▁possess ▁these ▁characteristics ▁- ▁a ▁narrow ▁pred ent ary