Spiniferites nanus Matsuoka, 1976, p.111, pl.28, figs.1–3. Holotype: Matsuoka, 1976, p.111, pl.28, figs.1–2. Taxonomic senior synonym: Hystrichosphaera (as Spiniferites) bulloidea, according to Matsuoka (1983a, p.23 — however, Matsuoka (1991, table 2 — p.8) and Mertens et al. (2018a, p.31) retained Spiniferites nanus. NIA. Age: Early Pleistocene.