Phthanoperidinium biconicum
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"biconicum" Jin Guangxing, He Chengquan and Zhu Shenzhao in He Chengquan et al., 1989, p.62, pl.7, figs.1-6; text-fig.9. Holotype: He Chengquan et al., 1989, pl.7, fig.6; text-fig.9. NOW Diconodinium. Originally Phthanoperidinium, subsequently (and now) Diconodinium. Age: Early Tertiary.
Parent: Phthanoperidinium
