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, B lateral arm plate C dorsal arm spine D ventral arm spine E disc spine F dorsal arm plate G–K vertebrae G proximal view H distal view I ventral view, J dorsal view, K lateral view. Abbreviations: d dorsal, de depression, dist distal, dl dorsal lobe, lac lateral ambulacral canals, mo muscle opening, no nerve opening, pb podial basin, prox proximal, ri ridge, th thorns, v ventral, vl ventral lobe. Scale bars: 800 µm (A, C, F–G, I–K); 500 µm (B, E, H); 100 µm (D).