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).

S. roeseli 5 clips cell 400 μm bristles present Mac. band-form Japan, 1998	S. roeseli 7 clips cell 400 μm bristles present Mac. band-form Japan, 1998	S. roeseli 4 clips telotroch bristles present Mac. band-form Japan, 1998
S. roeseli 5 clips conjugating pair bristles present Mac. band-form Japan, 1998	S. roeseli 4 clips Higashi-hiroshima Hiroshima, 1998	S. roeseli 6 clips Akigase park Saitama, 1998
S. roeseli ? 14 clips Higashi-hiroshima Hiroshima, 1998	S. roeseli 9 clips Higashi-hiroshima Hiroshima, 1998
S. polymorphus 5 clips bristles absent ? Mac. moniliform Japan, 1998	S. polymorphus 5 clips bristles absent ? Mac. moniliform Japan, 1998	S. polymorphus 4 clips Kanazawa Ishikawa, 1998
S. polymorphus 2 clips Vermont-Maine USA, 1999
S. coeruleus 12 clips kurome river Asaka Saitama, 1999	Stentor sp. 4 clips Higashi-hiroshima Hiroshima, 1998	Stentor sp. 4 clips Vermont-Maine USA, 1999

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