Solisphaeridium nanum (Deflandre, 1945) Turner, 1984

Originally Hystrichosphaeridium brevispinosum var. nanum, subsequently
Baltisphaeridium nanum (an acritarch species), thirdly Micrhystridium nanum (an acritarch species), fourthly Polygonium nanum (an acritarch species), fifthly (and
now) Solisphaeridium nanum; see also Baltisphaeridium brevispinosum var. nanum (an acritarch varietas; combination not validly published). This taxon was raised to specific rank by Stockmans and Williere, 1962 as Baltisphaeridium nanum.
Tax. sr. synonym of the acritarch Baltisphaeridium brevispinosum var. wenlockense (al. Salopidium wenlockense) Downie, 1959, according to Lister, 1970 and Turner, 1984.

Holotype: Deflandre, 1945, pl.1, figs.5-6
Age: Silurian