Sirmiodiniopsis orbis
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*orbis Drugg, 1978, p.73-74, pl.7, fig.11; pl.8, figs.1-4. Holotype: Drugg, 1978, pl.7, fig.11; Fensome et al., 1995, fig.1 - p.1631. Taxonomic junior synonym: Arkellidinium (as Sirmiodiniopsis) triapertum, according to Riley and Fenton (1982, p.199). Age: Callovian.
</CENTER> Parent: Sirmiodiniopsis