Ovoidinium verrucosum subsp. ostium

subsp. ostium (Davey, 1970, p.353, pl.4, figs.5-6; text-fig.1B) Lentin and Williams, 1975, p.2153.  Holotype: Davey, 1970, pl.4, fig.5.  Originally Ovoidinium ostium, subsequently Ovoidinium verrucosum var. ostium, thirdly (and now) Ovoidinium verrucosum subsp. ostium, fourthly Ascodinium verrucosum subsp. ostium.  Lentin and Williams (1989, p.270) retained this taxon as Ovoidinium verrucosum subsp. ostium.  Age: Albian-Early Cenomanian. Parent: Ovoidinium verrucosum