Protoperidinium harpeza Harland in Harland et al., 1991, p.653–654, fig.4f. Holotype: Harland et al., 1991, fig.4f. Originally Protoperidinium subgenus Protoperidinium section Selenopemphix (section name not validly published), subsequently Selenopemphix. Taxonomic senior synonym: Selenopemphix dionaeacysta, according to Head (1993, p.36). N.I.A. Age: early Pleistocene.