Hystrichosphaeropsis downiei
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"downiei" (Pocock, 1972, p.87, pl.22, figs.1–2; text-fig.2) Stover and Evitt, 1978, p.164. Holotype: Pocock, 1972, pl.22, figs.1–2; Jan du Chêne et al., 1986a, pl.97, figs.7–12. Originally Gonyaulacysta, subsequently Hystrichosphaeropsis, thirdly Rhynchodiniopsis?, fourthly Rhynchodiniopsis. Taxonomic senior synonym: Gonyaulax (as Hystrichogonyaulax) cladophora, according to Fisher and Riley (1980, p.320) and Kunz (1990, p.23). Age: Oxfordian–Kimmeridgian.
Parent: Hystrichosphaeropsis