Sirmiodiniopsis triaperta

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"triaperta" (Beju, 1979, p.4–5, fig.1, nos.1–6; figs.2A–A',B–E) Lentin and Williams, 1981, p.256.  Holotype: Beju, 1979, fig.1, no.1; figs.2A–A'; Fensome et al., 1995, figs.1,7–8 — p.1847.  Originally Arkellidinium, subsequently SirmiodiniopsisTaxonomic senior synonym: Sirmiodiniopsis orbis, according to Riley and Fenton (1982, p.199).  Age: late Callovian.

Parent: Sirmiodiniopsis