Hystrichosphaeridium sexradiatum

"sexradiatum" Timofeev, 1959, p.53, pl.4, fig.7.  Holotype: Timofeev, 1959, pl.4, fig.7.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A).  Taxonomic senior synonym: Hystrichosphaeridium (now Polygonium) polygonale Eisenack, 1931 ex Eisenack, 1938a, an acritarch species, according to Eisenack (1965c, p.261).  Age: Early Ordovician.

Parent: Hystrichosphaeridium