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 brachispina sp. nov., paratype (IDSSE-EEB-SW0107) A dorsal arm B ventral arm C lateral arm D lateral arm plate (small thorns on the lateral arm plate surface shown in the orange rectangle). Abbreviations: dap dorsal arm plate, das dorsal arm spine, lap lateral arm plate, ts tentacle scale, vap ventral arm plate, vas ventral arm spine. Scale bars: 1 mm (A–C); 200 µm (D).