Hystrichosphaeridium whitei Deflandre and Courteville, 1939; Emendation: Monteil, 1991a, p.444, as Cometodinium? whitei.

Now Cometodinium?. Originally Hystrichosphaeridium, subsequently Baltisphaeridium, thirdly Impletosphaeridium, fourthly Comasphaeridium, fifthly (and now) Cometodinium?.

Holotype: Deflandre and Courteville, 1939, pl.3, fig.5 (lost according to Monteil, 1991)
Neotype: Monteil, 1991a, pl.2, figs.1a-c; pl.3, fig.9, designated by Monteil (1991a, p.444); Fauconnier and Masure, 2004, pl.16, figs.7-8.
Age: Senonian