Sirmiodiniopsis orbis
From dinoflaj3
*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.
