Species:
Cell body slenderly trumpet shaped, 500-1000 μm long when fully extended;
macronucleus moniliform (10-20 macronuclear beads);
cortical granules colourless; without symbiotic green algae
(Foissner and Wölfl, 1994).
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Stentor polymorphus (Müller 1773) Ehrenberg, 1830: Colorless; with synbiotic 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).