Hystrichosphaeridium danicum
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"danicum" (Wetzel, 1952, p.396-397, pl.A, figs.5-6; text-fig.8) Wetzel, 1955, p.34. Emendation: Sarjeant, 1984c, p.129-130, as Achomosphaera danica. Holotype: Wetzel, 1952, pl.A, fig.6; Dietz et al., 1999, text-fig.6b. NOW Achomosphaera. Originally Areoligera, subsequently Baltisphaeridium (Appendix A), thirdly Hystrichosphaeridium, fourthly Cleistosphaeridium?, fifthly (and now) Achomosphaera. Taxonomic senior synonym: Areoligera senonensis, according to Lejeune-Carpentier and Sarjeant (1981, p.15) - however, Sarjeant (1984c, p.130) retained Hystrichosphaeridium (as Achomosphaera) danicum. Age: Paleocene.
Parent: Hystrichosphaeridium