Palaeohystrichophora "spinosissima" Deflandre, 1939a, p.179, pl.9, fig.11 ex Deflandre and Cookson, 1955, p.258.

NOW Pareodinia?. Originally Palaeoperidinium (name not validly published), subsequently Palaeohystrichophora, thirdly Acanthaulax?, fourthly Pareodinia, fifthly (and now) Pareodinia?.
The name Palaeoperidinium spinosissimum was not validly published in Deflandre (1939a) since the generic name Palaeoperidinium was not validly published until 1967.

Holotype: Deflandre, 1939a, pl.9, fig.11.
Age: Late Jurassic.