A tardigrade (phylum Tardigrada), also known as a water bear. This
speciment has been compressed to permit observation of the stylets and esophageal pump.
Photo by B. A. Jaffee
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Life stages of the soil amoeba, Theratromyxa weberi (Vampyrellidae).
A) Trophozoite. B) Contact with a nematode. C)
Encystment of a nematode. D) Digestive cyst of the amoeba. E)
Excystment of new amoebae.