From Williams et al., 2017:

[Filisphaeridium, Staplin et al., 1965, p.192
Acritarch genus.

For synonymy see Fensome et al., 1990.

Type species: originally as Micrhystridium setasessitante, Jansonius, 1962 (pl.16, fig.50)] ; Filisphaeridium setasessitante, Staplin et al., 1965