An illustrated catalogue of type specimens of the bathyal brittlestar genera Ophiomusium Lyman and Ophiosphalma H. L. Clark (Echinodermata: Ophiuroidea) Author Baker, Alan N. text Zootaxa 2016 4097 1 1 40 journal article 10.11646/zootaxa.4097.1.1 1bdc9f90-79e0-4265-b8b7-9057618b36db 1175-5326 270988 CD767562-3A19-4F4C-914D-80C50AD0D250 Ophiosphalma nitidum (H. L. Clark, 1939) . Figures 56 a, b Ophiomusium nitidum Clark, 1939 Ophiosphalma nitidum (Clark) ; Madsen, 1951; Guille & Vadon, 1986. FIGURE 53. Ophiosphalma jolliense MCZ 7048: a, b, dorsal and ventral disc sectors. FIGURE 54. Ophiosphalma laqueatum BMNH 82.12.23.417: a, b, dorsal and ventral disc sectors; c, basal arm segments. FIGURE 55. Ophiosphalma monoplax MCZ 509: a, b, dorsal and ventral disc sectors; c, view into one side of arm base, showing 3 basal lateral arm plates, and genital plates with prominent tooth-like papillae. FIGURE 56. Ophiosphalma nitidum BMNH1948.5.26.416: a, b, dorsal and ventral disc sectors. Holotype BMNH 198.5.26.416 John Murray Expedition station 177 Arabian Sea, 3840–3872 m . 2 paratypes , same station, 198.5.26.417, 1 paratype MCZ 6095 station 171, Arabian Sea, 3840–3872m . Main Features : Primary plates surrounded by small plates and all have a glazed appearance due to film of mucous. Areas between disc and arm plates with exposed tight skin. Comma- shaped genital slits. Ventral arm plates present on most of arm, loosely granular. Three pairs of exposed tentacle pores. Clark’s illustration is accurate.