Acanthaulax spinosissima

"?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