Achomosphaera hyperacantha
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"hyperacantha" (Deflandre and Cookson, 1955, p.264-265, pl.6, fig.7) Davey and Williams, 1969, p.4. 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 both taxa. Motile equivalent: Gonyaulax spinifera complex, according to Matsuoka et al. (1989, p.94). Age: Miocene.
Parent: Achomosphaera