Hemicystodinium zoharyi ssp. ktana (Rossignol, 1964, p.88, pl.2, figs.6–7,10; pl.3, fig.11) Lentin and Williams, 1973, p.67.

NOW Polysphaeridium zoharyi subsp. ktana. Originally Hystrichosphaeridium zoharyi var. ktana, subsequently Hemicystodinium zoharyi var. ktana (combination not validly published), thirdly Hemicystodinium zoharyi subsp. ktana, fourthly (and now) Polysphaeridium zoharyi subsp. ktana, fifthly Polysphaeridium subtile subsp. ktana.
Taxonomic junior synonym (at subspecific rank): Hystrichosphaeridium? breviatum, according to Islam (1983b, p.343) — however, Masure and Foucher in Fauconnier and Masure (2004, p.309–310) retained Hystrichosphaeridium? breviatum.

Holotype: Rossignol, 1964, pl.2, fig.7
Age: Pleistocene