Acanthaulax? aceras, (Eisenack, 1958), Stover and Evitt, 1978; Emendation as Cribroperidinium aceras: Sarjeant, 1985a, p. 57, 59

NOW Cribroperidinium. Originally Gonyaulax (Appendix B), subsequently Gonyaulacysta? (combination not validly published), thirdly Leptodinium, fourthly Acanthaulax?, fifthly (and now) Cribroperidinium.
Questionable assignment: Stover and Evitt (1978, p.137).

Holotype: Eisenack, 1958a, pl.21, fig.1; Sarjeant, 1985a, pl.4, figs.1-2; Jan du Chêne et al., 1986a, pl.2, figs.6-7.
Paratype: Eisenack, 1958
Age: Aptian.
Locus typicus: borehole at Marne, Feld Heide, N Germany

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Original description as Gonyaulax aceras: [Eisenack, 1958, p. 391]: (Translation Eisenack, 1958: Sarjeant, 1985):

Diagnosis:
Shell oval, without horns. Epi- and hypotheca almost equal. Transverse furrow spiral, narrow, delimited by solid but low crests. Plate boundaries only partially marked by crests, these and the plate surfaces being set with short, pointed tubercles, so that the tabulation is scarcely discernible.