Matsakision cassagnaui Bonnet, 1967
Diagnosis: Shell hyaline, elongated ovoid, very little compressed, truncated perpendicularly or very slightly obliquely in the region of the pseudostome. Pseudostome acrostome or very slightly plagiostome, sub-circular, with a very slight neck, without a chitinoid lip. Shell covered with elliptical scales, at the edge of the pseudostome subcircular plates whose major axis is arranged parallel to the edge of the pseudostome. About 7 plaques are visible across the width of the neck.
Dimensions: Length 34-38 µm; width 20-24 µm; thickness 18-22 µm; pseudostome 7-8 x 8-10 µm (n=6).
Ecology and distribution: Soil. Type location: Vityna Pass, Peloponnese, Greech, at 1000 m altitude, in sloping fir forest; powdery soil brought in by wind, at the base of mosses and of the fern Asplenium adiantum-nigrum, on limestone rock in the undergrowth.