Cleistosphaeridium echinoides
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"echinoides" (Maier, 1959, p.318-319, pl.32, figs.5-6) Davey et al., 1969, p.15. Holotype: Maier, 1959, pl.32, fig.6. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium. Taxonomic senior synonym: Xanthidium (as Spiniferites) ramosum, according to Sarjeant (1983, p.91-92). This combination was not validly published in Davey et al. (1966, p.170), since these authors did not fully reference the basionym. Age: mid-Oligocene-Mid Miocene.
Parent: Cleistosphaeridium