Spiniferites cornutus var. opisthophorus
From dinoflaj3
"var. opisthophorus" Cookson and Eisenack, 1974, p.62, pl.23, figs.1–4. Holotype: Cookson and Eisenack, 1974, pl.23, fig.1. Originally Spiniferites cornutus var. opisthophorus, subsequently Spiniferites cornutus subsp. opisthophorus. Taxonomic senior synonym (at subspecific rank): Hystrichosphaera cornuta var. cornuta, the autonym (as Spiniferites cornutus subsp. cornutus), according to Below (1982c, p.33). Age: Paleocene.
Parent: Spiniferites cornutus