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Pervosphaeridium truncigerum
Pervosphaeridium? truncigerum (Deflandre, 1937) Yun, 1981
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 Pervosphaeridium? truncigerum to be the sr. synonym; however, Lentin and Williams, 1985 retained Pervosphaeridium? truncigerum as a separate species. Lentin and Williams, 1981 and Lentin and Williams, 1985 retained this species in Pervosphaeridium; however, Harker and Sarjeant in Harker et al., 1990 retained it in Florentinia Davey and Verdier, 1973. Stover and Williams, 1987 considered this to be a "provisionally accepted species" of Pervosphaeridium.
Holotype: Deflandre, 1937, pl.13 [al. pl.10], fig.6
Age: Senonian
Original description (Yun Hyesu, 1981):
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 Pervosphaeridium? truncigerum to be the sr. synonym; however, Lentin and Williams, 1985 retained Pervosphaeridium? truncigerum as a separate species. Lentin and Williams, 1981 and Lentin and Williams, 1985 retained this species in Pervosphaeridium; however, Harker and Sarjeant in Harker et al., 1990 retained it in Florentinia Davey and Verdier, 1973. Stover and Williams, 1987 considered this to be a "provisionally accepted species" of Pervosphaeridium.
Holotype: Deflandre, 1937, pl.13 [al. pl.10], fig.6
Age: Senonian
Original description (Yun Hyesu, 1981):