Pentafidia charlottensis Backhouse, 1988

Holotype: Backhouse, 1988, pl.37, fig.8; text-fig.31B; Fensome et al., 1993, p.1045, fig.1
Locus typicus: Charlotte 1 borehole, Perth Basin, Western Australia, Australia; 1932 m, Parmelia Formation
Stratum typicum: Berriasian- ?earliest Valanginian

Original description: Backhouse, 1988, p.104-105
Cysts medium-sized, subspherical, ovoid, lenticular or flask-shaped. Autophragm 1.5 µm thick, rigid, and perfectly smooth. One or more large transverse folds developed across centre. Paratabulation indicated only by primary archeopyle suture and short accessory sutures. Paracingulum and parasulcus not expressed. Archeopyle apical, type [tA], operculum free. Primary archeopyle suture indicates 5 precingular paraplates. Paraplates 1" and 5"" are gabled, paraplates 2" and 4" may be asymmetrically gabled, paraplate 3" is always straight. Parasulcal notch deep and narrow. Principal archeopyle suture rather variable in relief, reflecting variable cyst shape. Operculum small, lacking accessory sutures, apparently composed of 4 fused apical paraplates.

Dimensions:
Holotype: length (without operculum) 61 µm, width 70 µm. Range of 30 specimens: length (without operculum) 51(57)63 µm, width 48(54)70 µm.