Adult hyopalatine arch, jaws, and opercular series of two Alestidae (cleared and double stained). A Alestopetersius smykalai (MTD-F 40165), 52.1 mm SL. B Rhabdalestes septentrionalis (MTD-F 40166), 43.0 mm SL. Abbreviations: An, angulo-articular; Apa, autopalatine; De, dentary; Ecpt, ectopterygoid; Enpt, endopterygoid; Hy, hyomandibular; Iop, interopercle; MC, Meckel’s cartilage; Met, metapterygoid; Mx, maxilla; Op, opercle; Pmx, premaxilla; Pop, preopercle; 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.