Exochosphaeridium pseudhystrichodinium

"?pseudhystrichodinium" (Deflandre, 1937b, p.73, pl.15 [al. pl.12], figs.3-4) Davey et al., 1969, p.16-17.  Emendation: Davey, 1969a, p.163, as Exochosphaeridium pseudhystrichodinium.  Holotype: Deflandre, 1937b, pl.15 (al. pl.12), fig.3; Eisenack and Kjellström, 1972, p.415; Fensome et al., 1995, fig.1 - p.1705.  NOW Pervosphaeridium.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Exochosphaeridium?, fourthly (and now) Pervosphaeridium.  Questionable assignment: Davey et al. (1969, p.16).  Taxonomic junior synonym: Hystrichosphaeridium (as Exochosphaeridium?) palmatum, according to Yun Hyesu (1981, p.29).  Ziaja (1989, p.214) considered Exochosphaeridium muelleri to be a questionable taxonomic junior synonym of this species.  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