Hystrichosphaeridium sexradiatum Timofeev, 1959

Originally Hystrichosphaeridium, subsequently Baltisphaeridium.
Tax. jr. synonym of Hystrichosphaeridium (now Goniosphaeridium) polygonale Eisenack, 1931 ex Eisenack, 1938, according to Eisenack, 1965.
Holotype: Timofeev, 1959, pl.4, fig.7
Age: Early Ordovician