Exochosphaeridium truncigerum (Deflandre, 1937) Davey, 1978

Now Raetiaedinium. Originally Hystrichosphaeridium, subsequently Litosphaeridium?, thirdly Cordosphaeridium, fourthly Exochosphaeridium, fifthly Pervosphaeridium, sixthly Tityrosphaeridium?, seventhly Florentinia, eighthly Pervosphaeridium?, ninethly (and now) Raetiaedinium.
Tax. jr. synonym of Xanthidium (now Hystrichokolpoma) crassipes Reade, 1839, by implication, according to Yun, 1981, who considered Exochosphaeridium (as Pervosphaeridium) truncigerum to be the sr. synonym. Lentin and Williams, 1985, retained Exochosphaeridium (as Pervosphaeridium) truncigerum as a separate species.
Lentin and Williams, 1981, retained this species in Cordosphaeridium Eisenack, 1963.

Holotype: Deflandre, 1937, pl.13 [al. pl.10], fig.6
Age: Senonian