From Williams et al., 2017:

[Pentafidia, Backhouse, 1988, p. 103-104

Type species: Pentafidia charlottensis, Backhouse, 1988 (pl.50, figs.1–3; text-figs.31A–C)]

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Original description: [Backhouse, 1988]:

Synopsis:
Cysts subcircular to ovoid, paratabulation indicated only by archeopyle. Autophragm smooth, punctate, or bearing fine non-tabular surface features. Archeopyle apical, type [tA], primary and accessory archeopyle sutures indicating 5 precingular and 4 apical paraplates.

Description:
Shape: Subspherical, ovoid, or slightly lenticular.
Wall relationships: Autophragm only.
Wall features: No parasutural features, surface smooth, finely punctate or bearing fine evenly distributed features.
Paratabulation: Indicated only by archeopyle and accessory sutures. Principal archeopyle suture indicates 5 precingular and 4 apical paraplates.
Archeopyle: Apical, type [tA], operculum free, constituent paraplates undifferentiated.
Paracingulum: Not expressed.
Parasulcus: Not expressed.
Size: Small to medium.