Hystrichosphaeridium oligacanthum subsp. granulatum
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"subsp. granulatum" Wetzel, 1952, p.404; text-fig.25. Emendation: Sarjeant, 1984c, p.136, as Surculosphaeridium? granulatum. Holotype: Wetzel, 1952, text-fig.25; Sarjeant, 1984c, pl.5, figs.1-3; text-fig.8. NOW Surculosphaeridium? granulatum. Originally Hystrichosphaeridium oligacanthum subsp. granulatum, subsequently Baltisphaeridium oligacanthum subsp. granulatum (Appendix A), thirdly Cleistosphaeridium? oligacanthum subsp. granulatum, fourthly (and now) Surculosphaeridium? granulatum. Age: Paleocene.Hystrichosphaeridium oligacanthum
