Xanthidium pilosum Ehrenberg, 1854

Now Barbatacysta. Originally Xanthidium, subsequently Hystrichosphaera, thirdly Hystrichosphaeridium, fourthly Baltisphaeridium (an acritarch genus), fifthly Tenua
Eisenack, 1968, sixthly Sentusidinium, seventhly Batiacasphaera, eighthly (and now) Barbatacysta; see also Cleistosphaeridium (combination not validly published).
Holotype: Ehrenberg, 1854, pl.37, fig.8, no.4
Age: Oxfordian