Hemicystodinium zoharyi (Rossignol, 1962) Wall, 1967

NOW Polysphaeridium. Originally Hystrichosphaeridium, subsequently Polysphaeridium? (combination not validly published), thirdly Hemicystodinium, fourthly (and now) Polysphaeridium.
Taxonomic junior synonyms: Polysphaeridium subtile, according to Islam (1983b, p.343) — however, Lentin and Williams (1989, p.300) retained Polysphaeridium subtile; Tenua (as Hemicystodinium?) taugourdeaui, according to Lentin and Williams (1981, p.26,127) — however, Tenua taugourdeaui is now considered a taxonomic junior synonym of Polysphaeridium subtile; Membranilarnacia delicata, according to Jain and Garg (1991, p.82).
Motile equivalent: Pyrodinium bahamense Plate, 1906, according to Wall and Dale (1969, p.140); Pyrodinium bahamense var. compressum Böhm, 1931, according to Matsuoka (1989, p.220).

Holotype: Rossignol, 1962, pl.2, fig.10
Age: Pleistocene