Surface features (A, B) and internal supporting skeleton (C, D) of the adhesive disc of Barryichthys A adhesive disc of Barryichthys hutchinsi (WAM P.28981-004, holotype, male, 15.4 mm SL), ventral view (anterior to top of page) B adhesive disc of B. algicola (WAM P.27127-016, holotype, female, 16.9 mm SL), ventral view (anterior to top of page) C adhesive disc supporting skeleton, including elements of the pelvic and pectoral-fin girdle of B. hutchinsi (WAM P.34510-001, paratype, 15.5 mm SL), ventral view (anterior to top of page). Postcleithra and pelvic-fin rays of the right side removed (image reversed) D pelvic-fin spine and rays of right side of B. hutchinsi (same specimen as in C), dorsal view (anterior to top of page). Abbreviations: A, disc region A; B, disc region B; Bp, basipterygium; C, disc region C; D, disc region D; DPcL, dorsal postcleithrum; I, pelvic-fin spine; PelR1–4, pelvic-fin rays 1–4; PRC, pelvic-radial cartilage; VPcL, ventral postcleithrum.