Baltisphaeridium whitei, (Deflandre and Courteville, 1939), Downie and Sarjeant, 1965

Now Cometodinium?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Impletosphaeridium, fourthly Comasphaeridium (an acritarch genus), fifthly (and now) Cometodinium?. This combination was not validly published in Sarjeant, 1959 since that author did not fully reference the basionym.

Holotype: Deflandre and Courteville, 1939, pl.3, fig.5
Age: Senonian