Acanthaulax spinosissima
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"?spinosissima" (Deflandre, 1939a, p.179, pl.9, fig.11 ex Deflandre and Cookson, 1955, p.258) Sarjeant, 1972, p.22. Holotype: Deflandre, 1939a, pl.9, fig.11. NOW Pareodinia?. Originally Palaeoperidinium (name not validly published), subsequently Palaeohystrichophora, thirdly Acanthaulax?, fourthly Pareodinia, fifthly (and now) Pareodinia?. Questionable assignment: Sarjeant (1972, p.22). Age: Late Jurassic.
Parent: Acanthaulax