Genus: When extended, trumpet-shaped or cylindrical; highly contractile; some with mucilaginous lorica; conspicuous peristomal field frontal; contractile vacuole anterior-left; fresh water (Kudo, 1966).
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).

->> Description at WPRNO

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With algal endosymbioints; macronucleus moniliform
S. polymorphus 410 x 100 μm Shiba river Owada Park Saitama, 2005	S. polymorphus 380 x 50 μm Banpaku memorial p. Tsukuba Ibaraki, 2006	S. polymorphus ? 500 x 160 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	S. polymorphus or S. muelleri ? 1120 x 160 μm Aizu Recreation p. Aizuwakamatsu Fukushima, 2005
S. polymorphus or S. muelleri ? μm Miyatoko m.5 Minami-Aizu Fukushima, 2008	S. polymorphus or S. muelleri ? μm Japan, 1998	S. polymorphus or S. muelleri ? μm Japan, 1998	S. polymorphus or S. muelleri ? μm Japan, 1998

Similar species ->> Stentor pyriformis; Stentor polymorphus;

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