Sirmiodiniopsis orbis

*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.

Parent: Sirmiodiniopsis