Fig. 1
The general morphology, embryonic development, and the definition of axes in cuttlefishes. a A schematic image of the cuttlefish body plan. b The general structure of the sucker of Decapodiformes. c The golden cuttlefish Sepia esculenta. d The kisslip cuttlefish S. lycidas. e, f Histological sections of the sucker in adult cuttlefishes. e S. esculenta. f S. lycidas. g The definition of the body axis of an embryo used in this study. h The definition of the axis of an arm. Scale bars: 200 μm. Abbreviations: ac, acetabulum; in, infundibulum; p, peduncle; srt, sucker ring teeth