Spiniferites cornutus subsp. opisthophorus
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"subsp. opisthophorus" (Cookson and Eisenack, 1974, p.62, pl.23, figs.1-4) Lentin and Williams, 1977b, p.150. 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
