Impletosphaeridium conicosum
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"conicosum" (Jiabo, 1978, p.57, pl.29, figs.4-5) Chen et al., 1988, p.7. Holotype: Jiabo, 1978, pl.29, fig.4. NOW Palaeohystrichodinium. Originally Bipolaribucina, subsequently Impletosphaeridium, thirdly (and now) Palaeohystrichodinium. Age: early Tertiary.
Parent: Impletosphaeridium