From Fensome et al., 2019:

Pterocystidiopsis, Deflandre, 1937b, p.90. Acritarch genus.
Taxonomic junior synonym: Caddasphaera, by implication in Courtinat in Courtinat and Gaillard (1980, p.80), who transferred the "type species" of Caddasphaera, Caddasphaera halosa, to Pterocystidiopsis -- however, Lentin and Williams (1981, p.31,237) retained Caddasphaera. This name was not validly published in Deflandre (1935, p.234) since no description was given.

Type: Deflandre, 1937b, pl.17 (also labelled pl.14), figs.7–8, as Pterocystidiopsis stephaniana.