Baltisphaeridium sexradiatum Appendix A
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"sexradiatum" (Timofeev, 1959, p.53, pl.4, fig.7) Downie and Sarjeant, 1965, p.96. Holotype: Timofeev, 1959, pl.4, fig.7. Originally Hystrichosphaeridium, subsequently Baltisphaeridium. Taxonomic senior synonym: Hystrichosphaeridium (now Polygonium) polygonale, according to Eisenack (1965c, p.261). This combination was not validly published in Downie and Sarjeant (1963, p.90), since these authors did not fully reference the basionym. Age: Early Ordovician.
Parent: Baltisphaeridium
