Suborder: Ventral cirri as 1 or more files of varied length; linear.
Family: Cirral file ends dorsally; body long, tapered at rear (Illustrated Guide, 1985).
Genus: Body ovoid, tail region absent (Carey, 1992). Same as the family (Illustrated Guide, 1985). Body elongate, cylindroid, adoral zone not narrowed; 4-5 frontal cirri; 2-5 spiral rows of ventral cirri; short peristomal area (easily distinguished from Stichotricha by peristome); not tube-dwelling (?) (How to know the protozoa, 1979).
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Strongylidium sp.1
138 x 34 μm
Namegawa
Saitama, 1998
Strongylidium sp.2
65 x 19 μm
Namegawa
Saitama, 1998
Strongylidium sp.2
190 x 25 μm
Numa-no-hara m.
Madarao highland
Niigata, 2005
Strongylidium sp.2
175 x 26 μm
Onnenai
Kushiro marsh
Hokkaido, 2005
Strongylidium sp.2
152 x 30 μm
Kashibaru m.3
Karatsu
Saga, 2006
Strongylidium sp.2
170 x 35 μm
Karakemi m.1
Omachi
Nagano, 2007
