Cleistosphaeridium oligacanthum subsp. complanatum

"subsp. complanatum" (Wetzel, 1952, p.404-405, pl.A, figs.11a-b) Lentin and Williams, 1973, p.29.  Emendation: Sarjeant, 1984c, p.142, as Solisphaeridium stimuliferum subsp. complanatum.  Holotype: Wetzel, 1952, pl.A, figs.11a-b; Sarjeant, 1984c, pl.4, fig.6; text-fig.13.  NOW Micrhystridium stimuliferum? subsp. complanatum (Appendix A).  Originally Hystrichosphaeridium oligacanthum subsp. complanatum, subsequently Baltisphaeridium oligacanthum subsp. complanatum (Appendix A), thirdly Cleistosphaeridium? oligacanthum subsp. complanatum, fourthly Solisphaeridium stimuliferum subsp. complanatum (Appendix A), fifthly (and now) Micrhystridium stimuliferum? subsp. complanatum (Appendix A).  Age: Paleocene. Parent: Cleistosphaeridium oligacanthum