Hystrichosphaeridium palmatum Deflandre and Courteville 1939

"palmatum" Deflandre and Courteville, 1939, p.101, pl.3, fig.1.  Holotype: Deflandre and Courteville, 1939, pl.3, fig.1.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Exochosphaeridium, fourthly Exochosphaeridium?.  Taxonomic senior synonym: Hystrichosphaeridium (as Pervosphaeridium) pseudhystrichodinium, according to Yun Hyesu (1981, p.29).  Junior homonym: Hystrichosphaeridium palmatum (White, 1842) Downie and Sarjeant, 1965.  Age: Late Cretaceous.

Parent: Hystrichosphaeridium