Wrevittia cassidata
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cassidata (Eisenack and Cookson, 1960, p.3, pl.1, figs.5–6) Helenes and Lucas-Clark, 1997, p.188. Emendations: Sarjeant, 1966b, p.125, as Gonyaulacysta cassidata; Helenes and Lucas-Clark, 1997, p.190, as Wrevittia cassidata. Holotype: Eisenack and Cookson, 1960, pl.1, fig.5; Jan du Chêne et al., 1986a, pl.40, figs.6–7. Originally Gonyaulax helicoidea subsp. cassidata, subsequently Gonyaulax cassidata, thirdly Gonyaulacysta cassidata, fourthly (and now) Wrevittia cassidata. Age: Aptian–Cenomanian.
