Genus: Body blunt at rear; kineties spiralled when body contracts (Illustrated Guide, 1985). Undulating membrane absent; lacnur canal from contractile vacuole (Carey, 1992).

S. intermedium 7 clips μm Japan, 1999	S. intermedium 3 clips μm Japan, 1998	S. intermedium 5 clips μm Japan, 1998
S. teres 3 clips μm Japan, 1998	S. minus 2 clips μm Japan, 1998	S. minus 3 clips μm Japan, 1998

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