Hystrichosphaeropsis variabilis Matsuoka and Bujak, 1988, p.49-50, pl.5, figs.5a-b,6-8; text-fig.8.
TYPE: Holotype: Matsuoka and Bujak, 1988, pl.5, figs.5a-b; text-fig.8.
AGE: Late Miocene.