Baltisphaeridium polytrichum, (Valensi, 1947), Downie and Sarjeant, 1965

Now Cleistosphaeridium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly (and now) Cleistosphaeridium. This combination was not validly published in Sarjeant, 1959 and 1962 since that author did not fully reference the basionym.

Holotype: Valensi, 1947, text-fig.4
Age: Late Bajocian