From Fensome et al., 2019:
Lejeunecysta catomus (Harland in Harland et al., 1991, p.651,653, figs.4d–e) Lentin and Williams, 1993, p.383. Holotype: Harland et al., 1991, fig.4d. Originally Protoperidinium subgenus Protoperidinium section Lejeunecysta (section name not validly published; Appendix B), subsequently (and now) Lejeunecysta. Contrary to the opinion of Lentin and Williams (1993, p.383), the name Protoperidinium catomus was validly published in Harland in Harland et al. (1991) since, although Lejeunecysta as a section name was not validly published, the species was assigned to the
validly published generic name Protoperidinium. NIA. Age: Early Pleistocene.

---------------------------------------------------------------------------------------------------