Acanthaulax? paliuros, (Sarjeant, 1962a, p. 260, pl. 1, fig. 7; text-fig. 5), Sarjeant, 1968, p. 227-228.

NOW Cribroperidinium. Originally Gonyaulax (Appendix B), subsequently Acanthogonyaulax (combination not validly published), thirdly Acanthaulax, fourthly Acanthaulax?, fifthly (and now) Cribroperidinium? (by Poulsen, 1996).
Questionable assignment: Stover and Evitt (1978, p.137).

Holotype: Sarjeant, 1962a, pl.1, fig.7.
Age: Oxfordian.
Locus typicus: Osmington Mills, Dorset
Stratum typicum: Epipeltoceras bimammatum- Zone, Oxfordian

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Original description as Gonyaulax paliuros: [Sarjeant, 1962, p. 260]:

Diagnosis:
A species of fossil Gonyaulax having an ovoidal theca with the tabulation ?5', 1a, 6", ?6''', 1'''' and without an apical horn. The sutures and the borders of the transverse and longitudinal furrows bear short, knobbed or briefly bifurcate spines, very densely set; similar spines, more widely spaced, are scattered over the entire thecal surface with the exception of the furrows.

Description:
Theca relatively small in size, yellowish in colour, without granulation or punctation. The transverse furrow is narrow and strongly laevo-rotatory its two ends differing in antero-posterior position by more than five times its width. The longitudinal furrow is broad.

Dimensions:
Holotype: Overall length 68 µm, without spines 63 µm; overall breadth 63 µm, without spines 57 µm; spines 2.5-3 µm in hight.
Range: Overall length 55-75 µm; overall breadth 45-75 µm.