Ontogeny of the hyopalatine arch, jaws, and opercular series of Silurus glanis (MTD-F 40168, cleared and double stained). A 11.2 mm SL. B 18.1 mm SL. C 29.6 mm SL. Distal tip of maxillary barbel cartilage not shown in b and c. Abbreviations: An-Ra, angulo-articulo-retroarticular; Apa, autopalatine; De, dentary; Enpt, endopterygoid; Hy, hyomandibular; Hy-PqC, hyomandibulo-palatoquadrate cartilage; Iop, interopercle; MC, Meckel’s cartilage; Met, metapterygoid; Mx, maxilla; MxBC, cartilage of maxillary barbel; Op, opercle; PAp, pars autopalatina; PMet, pars metapterygoideaPmx, premaxilla; Pop, preopercle; PQ, pars quadrata; Q, quadrate; SPop, suprapreopercle.