9 . 5 ▁million ▁years ▁ago . ▁It ▁was ▁found ▁in ▁the ▁low erm ost ▁form ational ▁unit ▁of ▁the ▁Upper ▁Rot lie g end ▁Group ▁or ▁Series ▁of ▁the ▁B rom acker ▁Qu ar ry , ▁the ▁middle ▁part ▁of ▁the ▁Th uring ian ▁Forest , ▁near ▁the ▁village ▁of ▁Tamb ach - Di eth arz . ▁Rot ary us ▁is ▁only ▁the ▁second ▁trem at op id ▁species ▁to ▁be ▁reported ▁from ▁the ▁B rom acker ▁local ity , ▁and ▁outside ▁of ▁United ▁States , ▁alongside ▁Tamb ach ia . ▁ ▁Ph y log eny ▁Rot ary us ▁is ▁character ized ▁by ▁a ▁unique ▁combination ▁of ▁characters , ▁including ▁the ▁two ▁following ▁aut ap omorph ies : ▁" ent ire ▁length ▁of ▁nas ol ac r imal ▁canal ▁exposed ▁as ▁a ▁smooth , ▁uniform ▁channel ▁in ▁which ▁the ▁anterior ▁half ▁coinc ides ▁with ▁the ▁max ill ary - lac r imal ▁s uture ; ▁and ▁par as phen oid ▁plate ▁has ▁an ▁outline ▁of ▁an ▁is os cel es ▁triangle , ▁with ▁the ▁shorter , ▁equal - length ▁later al ▁marg ins ▁conver ging ▁on ▁the ▁cult r iform ▁process ." ▁The ▁following ▁cl ad ogram ▁shows ▁the ▁ph y log en etic ▁position ▁of ▁Rot ary us , ▁from ▁B erman ▁et ▁al ., ▁ 2 0 1 1 . ▁ ▁Et ym ology ▁Rot ary us ▁was ▁first ▁named ▁by ▁David ▁S . ▁B erman , ▁Amy ▁C . ▁Hen r ici , ▁Thomas ▁Mart ens , ▁Stuart ▁S