Baltisphaeridium robustum ssp. fissum, (Sannemann, 1955), Downie and Sarjeant, 1965

Combination illegitimate since the specific name is illegitimate.
Now Multiplicisphaeridium robustum ssp. fissum (an acritarch subspecies). Originally Hystrichosphaeridium robustum ssp. fissum, subsequently Baltisphaeridium robustum ssp. fissum (combination illegitimate), thirdly (and now) Multiplicisphaeridium robustum ssp. fissum (an acritarch subspecies). This combination was no validly published in Downie and Sarjeant, 1963 since these authors did not fully reference the basionym.

Holotype: Sannemann, 1955, pl.6, fig.9
Age: Devonian (Late Givetian)