Hystrichosphaeridium sexradiatum
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"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