bulbosum (Ehrenberg, 1837b, pl.1, fig.17) Morgenroth, 1968, p.546. Emendation: Morgenroth, 1968, p.546–547, as Hystrichokolpoma bulbosum. Holotype: Ehrenberg, 1837b, pl.1, fig.17. Neotype: Morgenroth, 1968, pl.44, fig.6, designated by Morgenroth (1968, p.546). Originally Xanthidium bulbosum (Appendix A), subsequently Hystrichosphaera bulbosa (combination not validly published), thirdly Hystrichosphaeridium bulbosum, fourthly Ovum hispidum subsp. bulbosum (combination not validly published, Appendix A), fifthly (and now) Hystrichokolpoma bulbosum, sixthly Baltisphaeridium bulbosum (combination not validly published, Appendix A). Lentin and Williams (1977b, p.77) retained this species in Hystrichokolpoma. Taxonomic senior synonym: Xanthidium (as Hystrichosphaeridium) tubiferum, according to Stover and Evitt (1978, p.55) — however, Lentin and Williams (1981, p.134) retained Hystrichokolpoma bulbosum. The name Xanthidium bulbosum may not have been validly published in Ehrenberg (1837b) since no description in that publication has been referenced or found. Age: Danian.