Hystrichosphaeridium diploporum

"diploporum" Eisenack, 1951, p.190–191, pl.2, fig.6.  Holotype: Eisenack, 1951, pl.2, fig.6.  NOW Baltisphaeridium (Appendix A).  Originally Hystrichosphaeridium, subsequently Micrhystridium (name not validly published; Appendix A), thirdly (and now) Baltisphaeridium (Appendix A).  Age: Ordovician (erratic).

Parent: Hystrichosphaeridium