Figure 4 from: Conway KW, Stewart AL, Summers AP (2018) A new species of sea urchin associating clingfish of the genus Dellichthys from New Zealand (Teleostei, Gobiesocidae). ZooKeys 740: 77-95. https://doi.org/10.3897/zookeys.740.22712

Figure 4 Hyopalatine arch and opercular series (right side in lateral view [image reversed]) in members of Dellichthys. A D. trnskii, NMNZ P.062699, paratype, 41.8 mm SL B D. morelandi, NMNZ P.018388, 39.0 mm SL. Dashed lines indicate anterior extent of upper and lower jaws. Abbreviations: Ang, anguloarticular; Apa, autopalatine; Dn, dentary; Ect, ectopterygoid; Hyo, hyomandibular; Iop, interopercle; Mx, maxilla; Op, opercle; Pmx, premaxilla; Pop, preopercle; Q, quadrate; Ret, retroarticular; Sop, subopercle; Sym, symplectic.