Baltisphaeridium iaculigerum, Klement, 1960

Now Cleistosphaeridium. Originally Baltisphaeridium, subsequently Operculodinium?, thirdly (and now) Cleistosphaeridium.
Tax. sr. synonym of Cleistosphaeridium polyacanthum Gitmez, 1970, according to Brenner, 1988.

Holotype: Klement, 1960, pl.7, fig.10; Sarjeant, 1984, pl.2, fig.5; text-fig.7
Age: Middle Kimmeridgian