Sepispinula ?huguoniotii (Valensi, 1955a, p.38–39, text-fig.2a) Islam, 1993, p.88.

Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Acritarch), thirdly Cleistosphaeridium, fourthly Cleistosphaeridium?, fifthly Chlamydophorella, sixthly Sepispinula, seventhly (and now) Sepispinula?. Questionable assignment: Masure in Fauconnier and Masure (2004, p.500) as a problematic species.
Taxonomic senior synonym: Micrhystridium (as Polysphaeridium, now Sepispinula?) ambiguum, according to Yun Hyesu (1981, p.44) and Schiøler and Wilson (1998, p.328) — however, Masure in Fauconnier and Masure (2004, p.500) retained Hystrichosphaeridium (as and now Sepispinula?) huguoniotii.
Taxonomic junior synonym: Hystrichosphaeridium (now Sepispinula) ancoriferum, according to Clarke and Verdier (1967, p.54) — however, Masure in Fauconnier and Masure (2004, p.499) retained Hystrichosphaeridium (as and now Sepispinula) ancoriferum.

Holotype: Valensi, 1955a, text-fig.2a; Fauconnier and Masure, 2004, pl.72, figs.1–3.
Age: Late Cretaceous.