Hystrichosphaeridium echinoides

"echinoides" Maier, 1959, p.318–319, pl.32, figs.5–6.  Holotype: Maier, 1959, pl.32, fig.6.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium.  Taxonomic senior synonym: Xanthidium (now Spiniferites) ramosum, according to Sarjeant (1983, p.91–92).  Age: middle Oligocene–middle Miocene.

Parent: Hystrichosphaeridium