Achomosphaera triangulata
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triangulata (Gerlach, 1961, p.194-195, pl.29, fig.1) Davey and Williams, 1969, p.4. Emendation: Sarjeant, 1984b, p.82-83, as Achomosphaera triangulata. Holotype: Gerlach, 1961, pl.29, fig.1; Sarjeant, 1984b, pl.1, figs.4-5. Originally Baltisphaeridium (Appendix A), subsequently (and now) Achomosphaera. Age: mid Oligocene-mid Miocene.
Parent: Achomosphaera