Prismatocystis cylindrica Habib, 1970; Emendations: Prauss, 1989, p.47–48; Feist-Burkhardt and Monteil, 1994, p.7; Riding, 1994, p.18, all as Wallodinium cylindricum.

Now Wallodinium. Originally Prismatocystis, subsequently Hexagonifera, thirdly (and now) Wallodinium.
Taxonomic junior synonym: Fromea (as Wallodinium, now Phallocysta) elongata, according to Duxbury (1983, p.68) — however, Feist-Burkhardt and Monteil in Feist-Burkhardt (1990, p.615) retained Fromea (as Andreedinium) elongata.

Holotype: Habib, 1970, pl.10, fig.2
Age: Albian-Cenomanian