Hystrichosphaera hyperacantha
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"hyperacantha" Deflandre and Cookson, 1955, p.264–265, pl.6, fig.7. Holotype: Deflandre and Cookson, 1955, pl.6, fig.7. NOW Spiniferites. Originally Hystrichosphaera, subsequently Achomosphaera, thirdly (and now) Spiniferites. Taxonomic junior synonym (at specific rank): Hystrichosphaera furcata var. multiplicata, according to Matsuoka (1985a, p.35) — however, Londeix et al. (2009, p.66) retained the latter taxon. Motile equivalent: Gonyaulax spinifera (Claparède and Lachmann, 1859) Diesing, 1866, according to Matsuoka et al. (1989, p.94). Age: Miocene.
Parent: Hystrichosphaera