From Williams et al., 2017:

[Dilatisphaera, Lister, 1970, p.65
Acritarch genus.

Tax. jr. synonym of Hystrichosphaeridium Deflandre, 1937, according to Eisenack et al., 1973 - however, Cramer and Diez, 1979 retained Dilatisphaera as a separate genus.

Type species: Dilatisphaera laevigata, Lister, 1970 (pl.6, fig.10)]