FIGURE 6. Part of the pectoral girdle, lower jaw, branchial arch, and branchiostegal rays of Armigatus carrenoae sp. nov. from the Albian deposits of the Tlayúa lagerstätte, near Tepexi de Rodríguez, Puebla, Mexico. A, closeup of the head of the paratype IGM 11537 under UV light. B, idealized and simplified drawing based on A. Abbreviations: aa, anguloarticular; ac, anterior ceratohyal; bh, basihyal; br, branchiostegal ray; cl, cleithrum; cor, coracoid; ddml depression for the dento-maxillar ligament; den, dentary; dh, dorsal hypohyal; iop, interopercle; pc, posterior ceratohyal; pcl, postcleithrum; pfr, pectoral fin ray; prvas, prepelvic abdominal scutes; q, quadrate; rar, retroarticular; rad, radial; sca, scapula; sop, subopercle; sy, symplectic; uh, urohyal; vh, ventral hypohyal.