Protoperidinium ponticum (Wall and Dale in Wall et al., 1973, p.24–25, pl.1, figs.16–20; pl.2, figs.7–9) Matsuoka, 1985b, table 2 — p.5. Combination not validly published: basionym not fully referenced. NOW Peridinium (Appendix B). Originally (and now) Peridinium (Appendix B), subsequently Protoperidinium (combination not validly published). This species is based on fossil cysts. Age: late Quaternary.