Baltisphaeridium arrectum Appendix A
From dinoflaj2
arrectum (Timofeev, 1959, p.53, pl.4, fig.8) Downie and Sarjeant, 1965, p.87. Holotype: Timofeev, 1959, pl.4, fig.8. Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium. This combination was not validly published in Downie and Sarjeant (1963, p.89), since these authors did not fully reference the basionym. Age: Early-Mid Ordovician.
Parent: Baltisphaeridium
