Pileolus tuberosus  Coûteaux & Chardez, 1981

Diagnosis: Shell small, bumpy, with a circular pseudostome and a collar composed of small scales (2 × 1 μm), rectangular with rounded edges, concave along the length and arranged lengthwise on the periphery and secondly of a row of scales (L = 1 μm) carrying a hook (L = 0.5 μm) erected outwards. Very characteristic covering consisting of two types of scales, some larger oval (5 × 3 μm) with a central thickening of the same shape, the others smaller (1.2 × 1 μm) and almost circular filling all gaps between the large scales.

Measurements. Coûteaux and Chardez (1981): Shell length 25 μm; width 15 μm; pseudostome Ø 7 μm.

Habitat: Rhizosphere of a Bromelia in primary forest.

Geographical distribution: French Guiana, South-America.

References: Couteaux, M. & Chardez, D., 1981. Thécamoebiens édaphiques et muscicoles de Guyane Française. Rev. Écol. Biol. Sol, 18(2):193-208.