From Williams et al., 2017:

[Rugasphaera, Jiabo, 1978, p. 105-106
Acritarch genus.
Junior homonym: Rugasphaera Martin in Martin and Dean, 1988, an acritarch genus.

Type species: originally as Rugasphaera corrugis, Jiabo, 1978 (pl.40, fig.13)] ; Rugasphaera operculata