Ontogeny of the hyopalatine arch, jaws, and opercular series of Alestopetersius smykalai (MTD-F 40165, cleared and double stained). A 6.0 mm NL. B 9.0 mm SL. C 12.3 mm SL. D 15.6 mm SL. Abbreviations: An, angulo-articular; Apa, autopalatine; CM, coronomeckelian; De, dentary; Ecpt, ectopterygoid; Enpt, endopterygoid; Hy, hyomandibular; Hy-SyC, hyo-symplectic cartilage; Iop, interopercle; MC, Meckel’s cartilage; Met, metapterygoid; Mx, maxilla; Op, opercle; PAp; pars autopalatina; PMet, pars metapterygoidea; Pmx, premaxilla; Pop, preopercle; PQ, pars quadrata; Q, quadrate; Ra, retroarticular; Sop, subopercle; Sy, symplectic.

  Part of: Britz R, Mattox GMT, Conway KW (2023) The quadrate-metapterygoid fenestra of otophysan fishes, its development and homology. Vertebrate Zoology 73: 35-55. https://doi.org/10.3897/vz.73.e97922