Alterbidinium ambiguum
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ambiguum (He Chengquan, 1991, p.72–73, pl.29, figs.1–6) Lentin and Williams, 1993, p.21. Holotype: He Chengquan, 1991, pl.29, fig.3. Originally Alterbia (generic name illegitimate), subsequently (and now) Alterbidinium. Age: Cenomanian–middle Eocene.
Parent: Alterbidinium