Family: Cirral files spiral obliquely around body.
Genus: Slender or ovoid or fusiform; usually 4 spiral rows of crri; sometimes tube-dwelling
(Kudo, 1966).
Body long with pointed anterior; loricate; posterior of body blunt, round (Illustrated Guide, 1985).
S. gracilis posterior end pointed (Carey, 1992).
Species:
130-200 μm long; fresh water (Kudo, 1966).
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