Exochosphaeridium palmatum
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"?palmatum" (Deflandre and Courteville, 1939, p.101, pl.3, fig.1) Davey et al., 1969, p.16. Holotype: Deflandre and Courteville, 1939, pl.3, fig.1. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Exochosphaeridium, fourthly Exochosphaeridium?. Questionable assignment: Stover and Evitt (1978, p.154). Taxonomic senior synonym: Hystrichosphaeridium (as and now Pervosphaeridium) pseudhystrichodinium, according to Yun Hyesu (1981, p.29). This combination was not validly published in Davey et al. (1966, p.166), since these authors did not fully reference the basionym. Age: Late Cretaceous.
Parent: Exochosphaeridium