Spiniferites microceras subsp. opisthophorus

subsp. opisthophorus (Cookson and Eisenack, 1974, p.61, pl.22, fig.12) Lentin and Williams, 1977b, p.152.  Holotype: Cookson and Eisenack, 1974, pl.22, fig.12.  Originally Spiniferites microceras var. opisthophorus, subsequently (and now) Spiniferites microceras subsp. opisthophorus.  Age: Paleocene. Parent: Spiniferites microceras