Family: Body monopodial; pseudopods rare; locomotion by slight forward bulging; cysts common (Illustrated Guide, 1985).
Genus: Body 6-9 times longer than broad; hyaline cap 1-2 times as long as broad (How to know the ptozoa, 1979). Hyaline cap usually present in locomotion; cysts uninucleate (Illustrated Guide, 1985).
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Hartmannella sp.3
50 x 7 μm
L/W=7.1
Hiroshima, 1998
Hartmannella sp.2
40 x 6 μm
L/W=6.7
Hiroshima, 1998
Movies 
H. vermiformis ?
28 x 5 μm
L/W=5.6
Japan, 1998
Hartmannella ?
50 x 8 μm
L/W=6.3
Sagiyama m. p.
Saitama, 2002
Hartmannella ?
32 x 3.5 μm
L/W=9.1
Iruma river
Sayama
Saitama, 2004
Hartmannella ?
μm
L/W=
Ohyachi 1
Hachimantai
Akita, 2007
