Solisphaeridium? seminudum (W. Wetzel, 1952) Sarjeant, 1984

Originally Hystrichosphaeridium, subsequently Baltisphaeridium (an acritarch
genus), thirdly (and now) Solisphaeridium. Sarjeant, 1984 questionably included this species in Solisphaeridium.
Holotype: W. Wetzel, 1952, text-fig.26
Age: Paleocene (Danian)