Pulvinosphaeridium balticum (Eisenack, 1951) Eisenack, 1954

Combination not validly published since Eisenack, 1954 did not fully reference the basionym.
Now Goniosphaeridium (an acritarch genus). Originally Hystrichosphaeridium, subsequently Pulvinosphaeridium (combination not validly published), thirdly Veryhachium (an acritarch genus), fourthly (and now) Goniosphaeridium (an acritarch genus), fifthly Baltisphaeridium (an acritarch genus).
Holotype: Eisenack, 1951, pl.3, fig.10
Age: Early Ordovician