Subtilisphaera cretacea (Pocock, 1962, p.80, pl.14, figs.219–221 ex Davey, 1970, p.359) Jain and Millepied, 1973, p.27. Emendation: Harding, 1990a, p.44, as Palaeoperidinium cretaceum.

NOW Palaeoperidinium. Originally Palaeoperidinium (name not validly published), subsequently Astrocysta, thirdly Lejeunia? (combination illegitimate), fourthly Subtilisphaera, fifthly (and now) Palaeoperidinium.
Taxonomic junior synonyms: Lejeunia (as Palaeoperidinium) ampla, according to Harker and Sarjeant in Harker et al. (1990, p.128); Astrocysta (as Palaeoperidinium) manumcooksonii, according to Lentin and Williams (1976, p.110).

Holotype: Pocock, 1962, pl.14, fig.219
Age: Aptian-Albian