Surface features (A, C) and internal supporting skeleton (B, D) of the adhesive disc in species of Dellichthys in ventral view (anterior to top of page). A D. trnskii, AIM MA4341, 45.8 mm SLB D. trnskii, NMNZ P.062699, paratype, 41.8 mm SLC D. morelandi, TCWC 17269.03, 37.1 mm SLD D. morelandi, NMNZ P.018388, 39.0 mm SL. Abbreviations: A, disc region A; B, disc region B; Bp, basipterygium; C, disc region C; DPcL, dorsal postcleithrum; I, pelvic-fin spine; PelR1–4, pelvic-fin rays 1–4; VPcL, ventral postcleithrum.