Hystrichosphaeridium recurvatum var. parvum Rozen, 1965

Now Hystrichosphaeridium recurvatum ssp. parvum (name illegitimate). Originally Hystrichosphaeridium recurvatum var. parvum, subsequently (and now) Hystrichosphaeridium recurvatum ssp. parvum, thirdly Hystrichosphaeridium palmatum ssp. parvum (name illegitimate), fourthly Hystrichosphaeridium duplum ssp. parvum.
Holotype: Rozen, 1965, pl.4, fig.6, text-fig.13
Age: Late Eocene