Polysphaeridium subtile ssp. ktana (Rossignol, 1964) Islam, 1983

Now Polysphaeridium zoharyi ssp. ktana. Originally Hystrichosphaeridium
zoharyi var. ktana, subsequently Hemicystodinium zoharyi ssp. ktana, thirdly (and now) Polysphaeridium zoharyi ssp. ktana, fourthly Polysphaeridium subtile ssp. ktana; see also Hemicystodinium zoharyi var. ktana (combination not validly published).
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.
breviatum is the sr. synonym. Lentin and Williams, 1989 retained this taxon as a subspecies of Polysphaeridium zoharyi (Rossignol, 1962) Bujak et al., 1980.

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