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Hystrichosphaeridium sexradiatum

"Hystrichosphaeridium sexradiatum" Timofeev, 1959, p.53, pl.4, fig.7.

TYPE: Holotype: Timofeev, 1959, pl.4, fig.7.

HISTORY: Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A).

SYNONYM(S): Taxonomic senior synonym: Hystrichosphaeridium (now Polygonium) polygonale Eisenack, 1931 ex Eisenack, 1938a, an acritarch species, according to Eisenack (1965c, p.261).

AGE: Early Ordovician.


Infraspecific taxa:


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