gu an odon ▁and ▁Mant ell is aur us . ▁The ▁jug al ▁below ▁and ▁behind ▁the ▁orbit ▁be ars ▁the ▁same ▁shape ▁as ▁in ▁had ros aur ids , ▁with ▁a ▁high ▁rear ▁process , ▁and ▁art ic ulated ▁with ▁the ▁quadr ato j ug al ▁and ▁quadr ate ▁that ▁are ▁also ▁very ▁similar ▁to ▁more ▁derived ▁tax a . ▁As ▁in ▁other ▁orn ith op ods , ▁the ▁ ▁is ▁a ▁tri - rad iate ▁b one ▁surrounding ▁sides ▁of ▁the ▁orbit , ▁ ▁and ▁. ▁Contact ▁between ▁the ▁post orb ital ▁and ▁the ▁ ▁ex cludes ▁the ▁fl atten ed ▁and ▁wide ▁ ▁from ▁the ▁su pr at empor al ▁fen estra . ▁In ▁Our an osa urus ▁and ▁related ▁tax a ▁the ▁ ▁are ▁small , ▁and ▁art icul ates ▁with ▁the ▁bro aden ed ▁and ▁text ured ▁la cr imal . ▁Only ▁a ▁single ▁ ▁was ▁present ▁in ▁Our an osa urus , ▁which ▁projects ▁into ▁the ▁orbit ▁above ▁the ▁eye . ▁The ▁ ▁of ▁Our an osa urus ▁are ▁unique ▁among ▁orn ith isch ians . ▁The ▁b ones ▁are ▁unf used ▁suggesting ▁mob ility , ▁and ▁at ▁their ▁ends ▁on ▁the ▁top ▁of ▁the ▁sk ull ▁are ▁rounded ▁dom es , ▁which ▁were ▁described ▁by ▁Ta quet ▁( 1 9 7 6 ) ▁as ▁distinct ▁and ▁rug ose ▁" nas al ▁prot uber ances ". ▁ ▁The ▁sn out ▁was ▁to oth less ▁and ▁covered ▁in ▁a ▁horn y ▁she ath ▁during ▁life , ▁forming ▁a