Impletosphaeridium conicosum

"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