Protoperidinium catomus Harland in Harland et al., 1991, p.651,653, figs.4d–e. Holotype: Harland et al., 1991, fig.4d. NOW Lejeunecysta. Originally Protoperidinium subgenus Protoperidinium section Lejeunecysta (section name not validly published), subsequently (and now) Lejeunecysta. N.I.A. Age: early Pleistocene.