Palaeoperidinium cretaceum
cretaceum (Pocock, 1962, p.80, pl.14, figs.219–221 ex Davey, 1970, p.359) Lentin and Williams, 1976, p.110. Emendations: Harding, 1990a, p.44 and Evitt et al., 1998, p.50, both as Palaeoperidinium cretaceum. Holotype: Pocock, 1962, pl.14, fig.219. 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). The name Palaeoperidinium cretaceum was not validly published in Pocock (1962) since the generic name Palaeoperidinium was not validly published until 1967. Davey (1970, p.359), while validating the name as Astrocysta cretacea, proposed an "emendation". Age: Aptian–Albian.
