Baltisphaeridium danicum Appendix A
"danicum" (Wetzel, 1952, p.396-397, pl.A, figs.5-6; text-fig.8) Downie and Sarjeant, 1965, pl.89. 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, 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 Baltisphaeridium (as Achomosphaera) danicum. This combination was not validly published in Downie and Sarjeant (1963, p.91), since these authors did not fully reference the basionym. Age: Paleocene.
Parent: Baltisphaeridium