From Fensome et al., 2019:
Cribroperidinium? downiei (Sarjeant, 1960a, p.138–139) Poulsen, 1996, p.77. Holotype: Downie, 1957, pl.20, fig.10, as Hystrichosphaeridium pattei; Jan du Chêne et al., 1986a, pl.3, figs.7–9. Originally Baltisphaeridium (Appendix A),
subsequently Acanthaulax, thirdly Acanthaulax?, fourthly Cyclonephelium, fifthly (and now) Cribroperidinium?.
Questionable assignment: Poulsen (1996, p.77). Age: Kimmeridgian.

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Poulsen 1996, p. 77
Cribroperidinium? downiei (Sarjeant 1960) comb. nov.
Baltisphaeridium downiei Sarjeant, 1960, p. 138- 139.
Acanthaulax downiei (Sarjeant, 1960), Sarjeant, 1976, p. 6.
Cyclonephelium downiei (Sarjeant, 1960), Ioannides et al. 1977, p. 451.
Acanthaulax downiei (Sarjeant, 1960), Sarjeant, 1976, Lentin and Williams, 1977, p. 37.
Acanthaulax? downiei (Sarjeant, 1960), Sarjeant, 1976, Stover and Evitt, 1978, p. 137.
Acanthaulax downiei (Sarjeant, 1960) Sarjeant, 1976, Sarjeant, 1982, p. 47.
Remarks. Acanthaulax? downiei is provisionally included in Cribroperidinium.