Impletosphaeridium primordiale

"?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