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