Hystrichosphaeridium recurvatum ssp. parvum (Rozen, 1965) Lentin and Williams, 1973

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