Baltisphaeridium spiralisetum, (de Wit, 1943), Downie and Sarjeant, 1965

Now Cleistosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Cleistosphaeridium.

Holotype: De Wit, 1943, text-figs.2,11
Age: Late Cretaceous