Hystrichosphaeridium apiculatum Timofeev, 1959

Acritarch. Now Baltisphaeridium. Hystrichosphaeridium, subsequently (and now) Baltisphaeridium; see also Goniosphaeridium; combination not validly published).

Holotype: Timofeev, 1959, pl.4, fig.3
Age: Early Ordovician