From Williams et al., 2017:

[Platycystidia, Cookson and Eisenack, 1960a, p. 12
Acritarch genus, according to Stover and Evitt, 1978, and Fensome et al., 1990

Type species: as Platycystidia diptera, Cookson and Eisenack, 1960a (pl.3, fig.22)]