Millioudodinium monacanthum

"monacanthum" (Deflandre, 1936b, p.176–177, pl.5, fig.10 ex Sarjeant, 1967b, p.252) Stover and Evitt, 1978, p.174.  Holotype: Deflandre, 1935, pl.6, fig.1; Deflandre, 1936b, pl.5, fig.10; lost according to Jan du Chêne et al. (1986a, p.48).  NOW Apteodinium?.  Originally Palaeoperidinium (name not validly published), subsequently Gonyaulacysta, thirdly Millioudodinium, fourthly Apteodinium, fifthly (and now) Apteodinium?.  Age: Senonian.

Parent: Millioudodinium