Palaeohystrichodinium conicosum (Jiabo, 1978, p.57, pl.29, figs.4–5) He Chengquan et al., 2009, p.531.

Originally Bipolaribucina, subsequently Impletosphaeridium, thirdly (and now) Palaeohystrichodinium.

Holotype: Jiabo, 1978, pl.29, fig.4.
Age: Early Tertiary.

Original description (Jiabo, 1978):