Hystrichosphaeridium zoharyi var. ktana Rossignol, 1964

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.

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