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 Ophiomusium alecto A. H. Clark, 1936 . Figures 2 a, b Holotype USNM E0005197, north of Puerto Rico , 183–549 m , RV Caroline, Johnson-Smithsonian Deep Sea Expedition March 1933 . Main Features : Disc diameter 4 mm , disc circular. Arms 8 mm . Dorsal surface dominated by primary plates and radial shields. A large interradial plate present. First 5 dorsal arm plates swollen, remainder low and hardly visible. 3–4 arm spines, lower and middle ones longest. Two ventral arm plates, 2 pairs of exposed tentacle pores, genital slits long and raised at edges, sinuous.