From Fensome et al., 2019:
Spiniferites microceras ssp. laticornutus (Cookson and Eisenack, 1974, p.61, pl.22, fig.11) Lentin and Williams, 1977b, p.151. Holotype: Cookson and Eisenack, 1974, pl.22, fig.11. Originally Spiniferites microceras var. laticornutus, subsequently (and now) Spiniferites microceras subsp. laticornutus. Age: Paleocene.

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Original diagnosis: Cookson and Eisenack, 1974, p.61: Spiniferites microceras var. laticornutus
A variant of the Sp. microceras. Shell broadly oval, thin-walled. Processes relatively short, fairly sturdy (thick), in part interconnected with sporadically coarsely serrated spanning-membranes. The apex bears a short , but broad and flat horn, which sits on the apex with a broad base, again becomes broader after having become slightly narrower and terminates into several pointed extremities, of which the two external ones are the longest.
Dimensions: Shell about 70 x 65 µm, overall about 86 x 82 µm, horn about 14 µm long and in the middle about 5 µm wide.
Occurrence: Rivernook Bed, Victoria.