Spiniferites microceras var. opisthophorus

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"var. opisthophorus" Cookson and Eisenack, 1974, p.61, pl.22, fig.12.  Holotype: Cookson and Eisenack, 1974, pl.22, fig.12.  NOW Spiniferites microceras subsp. opisthophorus.  Originally Spiniferites microceras var. opisthophorus, subsequently (and now) Spiniferites microceras subsp. opisthophorus.  Age: Paleocene. Parent: Spiniferites microceras