Baltisphaeridium stimuliferum, (Deflandre, 1938), Sarjeant, 1961

Now Solisphaeridium (an acritarch genus). Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Solisphaeridium (an acritarch genus); see also Filisphaeridium (an acritarch genus; combination not validly published) and Micrhystridium (an acritarch genus; combination not validly published).

Holotype: Deflandre, 1938, pl.10, fig.10
Age: Late Jurassic