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Cribroperidinium parorthoceras
Cribroperidinium parorthoceras (Davey, 1968) Helenes, 1984
Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Cribroperidinium?. At the time of the transfer, Helenes (1984, p.130) considered this to be a "provisionally assigned species" of Cribroperidinium.
Holotype: Sarjeant, 1966, pl.14, figs.5-6, text-fig.29 (as Gonyaulacysta orthoceras); Jan du Chêne et al., 1986, pl.26, figs.6-8
Locus typicus: Speeton, W Heslerton, England
Stratum typicum: Late Barremian
Original diagnosis: Davey, 1968, p.1: Gonyaulacysta parorthoceras
Shell ovoidal with strong, tapering apical horn accounting for about one-fifth to one quater of overall length. Shell wall of moderate thickness, granular to tuberculate. Tabulation 4", 1a, 6"", ?6c, 7""", 1p, 1""""; crests low, bearing small spinelets. Cingulum strongly spiral, of moderate breadyh: sulcus broad and extending to antapex.
Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Cribroperidinium?. At the time of the transfer, Helenes (1984, p.130) considered this to be a "provisionally assigned species" of Cribroperidinium.
Holotype: Sarjeant, 1966, pl.14, figs.5-6, text-fig.29 (as Gonyaulacysta orthoceras); Jan du Chêne et al., 1986, pl.26, figs.6-8
Locus typicus: Speeton, W Heslerton, England
Stratum typicum: Late Barremian
Original diagnosis: Davey, 1968, p.1: Gonyaulacysta parorthoceras
Shell ovoidal with strong, tapering apical horn accounting for about one-fifth to one quater of overall length. Shell wall of moderate thickness, granular to tuberculate. Tabulation 4", 1a, 6"", ?6c, 7""", 1p, 1""""; crests low, bearing small spinelets. Cingulum strongly spiral, of moderate breadyh: sulcus broad and extending to antapex.