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).
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