Hystrichosphaeridium echinoides
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"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