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: 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).

->> Description at WPRNO

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Many subnuclei
S. muelleri ? 460 μm Japan, 1998	S. muelleri or S. cornutus ? 200 x 55 μm riverside park Kuroiso Tochigi, 2005
Macronucleus nodular
S. muelleri ? Mac. nodular bristles only anterior μm Japan, 1998	S. muelleri ? Mac. nodular bristles only anterior μm Koaze river Saitama, 2002	S. muelleri ? cell division bristles only anterior μm USA, 1999 Movies
Several large subnuclei
S. muelleri or S. cornutus ? large subnuclei μm Kanazawa Ishikawa, 1998	S. muelleri or S. cornutus ? large subnuclei 620 μm Japan, 1998	S. muelleri or S. cornutus ? μm Isogawa g.p.2 Kaminokawa Tochigi, 2008

Similar species ->> Stentor roeseli;

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