FIGURE 7. IHNFG 2986, a gonorhynchid fish from El Chango quarry. Abbreviations: fr, frontal; io 2-3, infraorbitals 2 and 3; mx, maxilla; op, opercle; pop, preopercle;r, ribs (first pair); sn 3-5, supraneurals 3–6; sop, subopercle; tpe, teeth patch on the endopterygoid; x, area in which the supraneurals 1-3 are in contact each other. Scale bars equal 30 mm.