Baker (2016) suggested that O. serratum should be transferred to Ophiosphalma but without examination of the type and without comments.
Baker, A. N. (2016). An illustrated catalogue of type specimens of the bathyal brittlestar genera Ophiomusium Lyman and Ophiosphalma H. L. Clark (Echinodermata: Ophiuroidea). Zootaxa. 4097(1): 1-40.