▁ch est ▁radi ograph . ▁ ▁A ort ope xy ▁is ▁a ▁surg ical ▁procedure ▁in ▁which ▁the ▁a ort ic ▁arch ▁is ▁fixed ▁to ▁the ▁stern um ▁in ▁order ▁to ▁keep ▁the ▁tra che a ▁open . ▁ ▁Add itional ▁images ▁ ▁References ▁ ▁External ▁links ▁▁▁ ▁Right ▁A ort ic ▁Arch ▁An atom y ▁Te aching ▁Case ▁from ▁Med P ix ▁ ▁Category : Ar ter ies ▁of ▁the ▁thor ax ▁arch <0x0A> </s> ▁S unda ▁is ▁a ▁got ra ▁( cl an ) ▁of ▁J ats ▁found ▁in ▁H ary ana ▁Raj as than ▁state ▁of ▁India ▁ ▁References ▁▁ ▁Category : J at ▁cl ans ▁of ▁H ary ana ▁Sach in ▁S unda <0x0A> </s> ▁L anth anos uch o idea ▁is ▁an ▁ext inct ▁super family ▁of ▁an ky ram orph ▁par are pt iles ▁from ▁the ▁middle ▁Pennsylvan ian ▁to ▁the ▁middle ▁Gu adal up ian ▁epo ch ▁( M osc ov ian ▁- ▁Word ian ▁stages ) ▁of ▁Europe , ▁North ▁America ▁and ▁Asia . ▁It ▁was ▁named ▁by ▁the ▁Russian ▁pale ont ologist ▁I v ach nen ko ▁in ▁ 1 9 8 0 , ▁and ▁it ▁contains ▁two ▁families ▁A cle istor hin idae ▁and ▁L anth anos uch idae . ▁ ▁Ph y log eny ▁ ▁L anth anos uch o idea ▁is ▁a ▁node - based ▁tax on ▁defined ▁in ▁ 1 9 9 7 ▁as ▁" the ▁most ▁recent ▁common ▁ancest or ▁of ▁L anth anos uch us , ▁L anth