Wrevittia diutina
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?diutina (Duxbury, 1977, p.34-35, pl.1, figs.3-4; text-fig.9) Helenes and Lucas-Clark, 1997, p.190. Holotype: Duxbury, 1977, pl.1, fig.3; text-fig.9.; Jan du Chêne et al., 1986a, pl.41, figs.3-4. Originally Gonyaulacysta, subsequently Millioudodinium, thirdly (and now) Wrevittia?. Questionable assignment: Helenes and Lucas-Clark (1997, p.190). Taxonomic senior synonym: Gonyaulax (as Gonyaulacysta, now Wrevittia) helicoidea, according to Stover and Helby (1987d, p.287) - however, Jan du Chêne et al. (1986a, p.130) and Lentin and Williams (1989, p.152) retained Gonyaulacysta (now Wrevittia?) diutina. Age: Berriasian-Hauterivian.
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