Pervosphaeridium elegans Louwye, 1997, p.152, pl.2, figs.10–11.

Taxonomic junior synonym: Cleistosphaeridium hallembayense (name not validly published), according to Slimani (2001a, p.193).

Holotype: Louwye, 1997, pl.2, figs.10–11.
Age: Campanian.

Original description (Louwye, 1997):