Spinidinium echinoideum subsp. rhombicum

subsp. rhombicum (Cookson and Eisenack, 1974, p.49-50, pl.20, figs.5-9) Lentin and Williams, 1976, p.64.  Holotype: Cookson and Eisenack, 1974, pl.20, fig.7.  Originally Deflandrea rhombica, subsequently (and now) Spinidinium echinoideum subsp. rhombicum, thirdly Spinidinium rhombicum.  Lentin and Williams (1981, p.257) retained this taxon as Spinidinium echinoideum subsp. rhombicum.  Age: Albian-Cenomanian. Parent: Spinidinium echinoideum