From Williams et al., 2017:

[Pilosidinium, Courtinat, 1989, p.190, 193

Type species: originally as Tenua echinata, Gitmez and Sarjeant, 1972 (pl.1, fig.1)] ; Pilosidinium echinatum, Courtinat, 1989

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Original description: [Courtinat, 1989 (Translation: LPP)]:

Diagnosis:
Subspherical to ovoidal apteate cyst with an autophragm only. The cyst is covered with nontabular ornaments. These ornaments consist of capitate or bifurcate conical spines, or granulae, sometimes distally or proximally interconnected. No single paratabulation element is visible but the apical archaeopyle and the accessory archaeopyle sutures. The operculum is adnate multiplated.

Affinities:
The genus Pilosidinium differs from the genus Neuffenia Brenner and Dörr, 1986 in the presence of short processes, whereas Neuffenia possesses a scabrate autophragm.