Cleistosphaeridium oligacanthum subsp. oligacanthum
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"subsp. oligacanthum". Autonym. Holotype: Wetzel, 1952, pl.A, fig.8; Sarjeant, 1984c, pl.2, figs.4-5; text-fig.2; Fensome et al., 1995, figs.1-5 - p.1625. Now redundant. Originally Hystrichosphaeridium oligacanthum subsp. oligacanthum, subsequently Baltisphaeridium oligacanthum subsp. oligacanthum (Appendix A), thirdly Cleistosphaeridium? oligacanthum subsp. oligacanthum.
Parent: Cleistosphaeridium oligacanthum