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 altum Koehler, 1904 . Figure 3 a, b Ophiomusium altum Koehler, 1904 ; H. L. Clark, 1939 . Syntypes (3) RMNH V.Ech. O .2045, Siboga Station 76, Makassar Straits, Indonesia , 2029 m . Other material examined: 1 specimen BMNH 1948 -5-26-16-364, Gulf of Aden, John Murray Expedition Station 26, 2312 m., 2 specimens BMNH 1948 -5-26-365, Zanzibar , John Murray Expedition station 118, 1789 m. Main Features : Disc 5 mm diameter, inflated, highest point is the rosette plates and the central plate has a central prominence. There are 2 pairs of exposed tentacle pores with one scale on each. Arms are thin with long joints, carrying 4 small and closely set arm spines. A second, smaller specimen is with the holotype , but is not labelled as a type specimen.