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Lobosea: Gymnamoebia: Amoebida: Amoebidae

Amoeba proteus
(Pallas, 1766) Leidy 1878 or Leidy, 1879

Amoeba proteus Genus: Pseudopods do not meld at bases during polypodial locomotion; pseudopods ridged; uninucleate (Illustrated Guide, 1985).
Species: Monopodal, 300-600 μm long; pseudopods, cylindroid, granular, with clear caps, longitudinal ridges; uroid, temporary, morulate; nucleus, discoid to polymorphic, often biconcave, 30-35 μm diam (Illustrated Guide, 1985). Up to 600 μm or more; one discoid nucleus, 30 μm, sometimes folded (How to know the protozoa, 1979).
Similar Genus -->> Trichamoeba; Polychaos

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Amoeba sp. (A. proteus ?), cell body μm long, μm wide, L/W=, x 640, Obihiro-Hasshonochi (the birthplace of Obihiro) park, Obihiro city, Hokkaido, Japan, October 13, 2005 by Y. Tsukii
scale 100 μm scale 200 μm scale 300 μm; x 200
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