Palaeoperidinium hyalodermum
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"hyalodermum" Deflandre, 1939b, p.144, pl.6, figs.3–4. Holotype: Deflandre, 1939b, pl.6, figs.3–4; Jan du Chêne et al., 1986a, pl.58, figs.1–5. Name not validly published: generic name not validly published until 1967. NOW Impagidinium?. Originally Palaeoperidinium (name not validly published), subsequently Gonyaulacysta, thirdly Gonyaulacysta?, fourthly Rhynchodiniopsis?, fifthly (and now) Impagidinium?. Age: Kimmeridgian.
Parent: Palaeoperidinium