Skull of <i>Yelangichthys</i>.

<p>Line drawings of GMPKU-P1358 (holotype) in <b>A</b>, dorsal; <b>B</b>, lateral view. Anterior facing right. <b>Abbreviations</b>: <b>amyd</b>, anterodorsal myodome; <b>amyv</b>, anteroventral myodome; <b>asp</b>, ascending process of parasphenoid; <b>cp.Dpt</b>, caudal process of Dermopterotic; <b>crs.p</b>, craniospinal process; <b>dp.sp</b>, depressions in spiracular groove; <b>Dpt</b>, dermopterotic; <b>ex.n1,2</b>, external naris 1, 2; <b>f.am</b>, mandibular adductor muscular fossa; <b>f.oa1</b>, foramina of orbital artery; <b>f.hm</b>, articular facet for hyomandibular; <b>f.ic+ep</b>, foramen of internal carotid artery and efferent pseudobranchial artery; <b>f.max.buc</b>, foramen of canal transmitting ramus maxillaris trigemini and ramus buccalis lateralis and vessels; <b>haem</b>, notch indicating position of anterior end of haemal canal; <b>f.om</b>, foramen of great ophthalmic artery; <b>f.opa</b>, foramen of optical artery; <b>f.pv</b>, foramen of pituitary vein; <b>fac.art.pal</b>, articular facet for autopalatine; <b>pnw</b>, postnasal wall; <b>fe.op</b>, optical fenestration; <b>Fr</b>, frontal; <b>g.cv</b>, groove of an unnamed vessel; <b>g.I,</b> groove for olfactory nerve; <b>g.ic</b>, groove for internal carotid artery; <b>br</b>, bony bridge of olfactory groove; <b>g.om</b>, groove for great ophthalmical; <b>io.c</b>, infraorbital sensory canal and its foramina; <b>i.ow</b>, interorbital wall; <b>jc</b>, posterior opening of jugular canal; <b>lc</b>, lateral commissure; <b>my</b>, posterior myodome; <b>Na-ao</b>, nasaloantorbital; <b>oach</b>, area of origin of dorsal hyoid constrictor muscle; <b>Pa</b>, parietal; <b>po.p</b>, postorbital process; <b>Ps</b>, parasphenoid; <b>Ro-pm</b>, rostropremaxilla; <b>sa</b>, smooth area on dermal skull roof; <b>so.c</b>, openings of supraorbital sensory canal; <b>Socp</b>?, supraoccipital?; <b>sp.t</b>, spiracular teeth; <b>spg</b>, spiracular groove; <b>stc</b>, supratemporal commissure of lateral lines; <b>tf.c</b>, trigeminofacialis chamber; <b>tp</b>, teeth plate on ventral side of parasphenoid; <b>Vo</b>, vomer; <b>II</b>, optical nerve or its canal; <b>III</b>, foramen of oculomotor nerve; <b>VI</b>, foramen of abducens nerve; <b>IX</b>, foramen of glossopharyngeal nerve; <b>X</b>, foramen of vagus nerve.