Species: Colorless; with symbiotic Chlorella; 1-2 mm long when extended; macronucleus beaded; anterior end expanded (Kudo, 1966). Elongate, may attain 1-2 mm; peristome wide; macronucleus moniliform; no somatic bristles; colourless but zoochlorellae may be present (Carey, 1992). Cell body slenderly trumpet shaped, up to 2 mm long when fully extended; macronucleus moniliform (more than 10 connected beads); cortical granules colourless; with symbiotic green algae (Foissner and Wölfl, 1994).

100 μm 200 μm 300 μm; x 200 : 50 μm 100 μm 150 μm; x 400