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 mutum ( Hertz) 1927 . Figures 26 a, b Ophiomusium facunda var muta Hertz 1927 . Ophiomusium facundum mutum Hertz, 1927 . Stöhr, 2015 . Syntypes (2) ZMUC, Valdivia Station 254, off southern Somalia , 977m . Main Features : The larger of the two type specimens of this species is 16 mm d.d. It has tiny arm spines, dominating lateral arm plates, and has narrower oral shields than O . facundum , and the ventral interradial plate is naked. These features separate it from that species. The holotype of O . mutum is in the Berlin Museum. A recent enquiry to the ZMUC about the syntypes indicated that they cannot now be identified in the collection.