Impletosphaeridium primordiale
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"?primordiale" Wetzel, 1967b, p.41–42, pl.3, fig.18. Holotype: Wetzel, 1967b, pl.3, fig.18. Taxonomic senior synonym: Hystrichosphaeridium (now Polygonium — Appendix A) polygonale, according to Eisenack et al. (1973, p.497–498). Questionable assignment: Wetzel (1967b, p.41). Age: Ordovician.
Parent: Impletosphaeridium