Review of Ophioplinthaca Verrill, 1899 (Echinodermata, Ophiuroidea, Ophiacanthidae), description of new species in Ophioplinthaca and Ophiophthalmus, and new records from the Northwest Pacific and the South China Sea

Ophioplinthaca sp. (IDSSE-EEB-SW0108) A dorsal disc B ventral disc C center of the disc D–F disc spines G radial shield H lateral disc I oral frame J ventral side of the arm base K dorsal arm L ventral arm M lateral arm. Abbreviations: as adoral shield, dap dorsal arm plate, das dorsal arm spine, dp disc plate, gs genital slit, j jaw, lap lateral arm plate, m madreporite, os oral shield, rs radial shield, ts tentacle scale, vap ventral arm plate, vas ventral arm spine. Scale bars: 1 mm (A, B, M); 500 µm (C, E, G–L); 200 µm (D, F).