Hystrichosphaeridium palmatum Deflandre and Courteville 1939
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"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
