From Williams et al., 2017:

[Ollula, Goczan, 1962, p.194, 200.
Acritarch genus. Not a dinoflagellate genus, according to Stover and Evitt, 1978.

Type species: originally as Ollula ollula, Góczán, 1962 (pl.3, figs.11–16)] ; Ollula goczanii, Loeblich Jr. and Loeblich III, 1966