Baltisphaeridium brevispinosum var. nanum, (Deflandre, 1945), Downie, 1959

Combination not validly published since Downie, 1959 did not fully reference the basionym.
Now Solisphaeridium nanum (an acritarch species). Originally Hystrichosphaeridium brevispinosum var. nanum, subsequently Baltisphaeridium brevispinosum var. nanum (combination not validly published), thirdly Baltisphaeridium nanum (an acritarch species; name not validly published)
fourthly Micrhystridium nanum (an acritarch species), fifthly Polygonium nanum (an acritarch species), sixthly (and now) Solisphaeridium nanum (an acritarch species).
Tax. sr. synonym of the acritarch varietas 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