Difflugia cashii Playfair, 1917 *)
Basionym: Difflugia globulus var. cashii Playfair, 1917

Diagnosis: Shell globular, very small and chitinous, adorned with very fine grains that are typically sparse and widely spaced. The aperture is circular, simple, and sharply edged, usually not bordered by flint particles. In some cases, the aperture is smaller than the base.

Dimensions: According to Playfair (1917): Shell length 21—30 µm; width 19—31 µm; base (=aperture) 6—18 µm, or base 11—21 µm; aperture 6—16 µm (n=30) .

Habitat: Freshwater.

Geographical distribution: Australia.

Remarks: Playfair (1917): “This is the very small, chitinous form figured by Cash, PL xxi., f.8, 9, whose figure works out at 30 µm broad. It is very common and widespread here, while I have never met with a specimen anything near the size of the type (30×34 µm, my largest) which Penard gives as 70-100 µm, and Leidy 65-260 µm. The latter mentions these small, chitinous tests at about 24×32 µm, Their very small size, delicate test, and orifice smaller than the truncate base give them a claim to he set apart as a distinct variation.