Cleistosphaeridium ?israelianum, (Rossignol, 1962, p.132, pl.2, fig.3), Davey et al., 1966, p.170.

Combination not validly published: basionym not fully referenced.
NOW Operculodinium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cleistosphaeridium (combination not validly published), fourthly (and now) Operculodinium, fifthly Cordosphaeridium (combination not validly published).
Taxonomic junior synonyms: Cleistosphaeridium cephalum, according to Jain and Garg (1991, p.78); Operculodinium crassum, according to Edwards and Andrle (1992, p.262) — however, Head (1996b, p.1231) retained Operculodinium crassum; and Hystrichosphaeridium westii (name not validly published), by implication in Wall and Dale (1968a, p.315, as "hystrichosphere type x of West"). Motile equivalent: Peridinium (now Protoceratium) reticulatum Claparède and Lachmann, 1859, questionably according to Wall and Dale (1968c, p.272), and without question according to Matsuoka (1989, p.224).

Holotype: Rossignol, 1962, pl.2, fig.3.
Age: Pleistocene.