Palaeoperidinium spinosissimum
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"spinosissimum" Deflandre, 1939a, p.179, pl.9, fig.11. Holotype: Deflandre, 1939a, pl.9, fig.11. Name not validly published: generic name not validly published until 1967. NOW Pareodinia?. Originally Palaeoperidinium (name not validly published), subsequently Palaeohystrichophora, thirdly Acanthaulax?, fourthly Pareodinia, fifthly (and now) Pareodinia?. Age: Late Jurassic.
Parent: Palaeoperidinium