Baltisphaeridium oligacanthum subsp. complanatum Appendix A
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"subsp. complanatum" (Wetzel, 1952, p.404-405, pl.A, figs.11a-b) Downie and Sarjeant, 1965, p.93. 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, thirdly Cleistosphaeridium? oligacanthum subsp. complanatum, fourthly (and now) Solisphaeridium stimuliferum subsp. complanatum (Appendix A), fifthly Micrhystridium stimuliferum? subsp. complanatum (Appendix A). Age: Paleocene.Baltisphaeridium oligacanthum
