Fauna
Invertebrate

Amoeba proteus

Amoeba proteus

Also known as Proteus Animalcule

Amoeba proteus is a classic single-celled freshwater organism celebrated for its shifting morphology and fluid locomotion. Using blunt, finger-like pseudopodia powered by dynamic cytoplasmic streaming, it creeps along decaying pond substrate to engulf bacteria, microalgae, and smaller protozoans through phagocytosis. Its exceptionally large size among protists makes it a cornerstone laboratory specimen for observing intracellular structures such as the contractile vacuole and disk-shaped nucleus.

MicroscopicFreshwaterSingle-Celled
Amoeba proteus reference
(c) Dominic, some rights reserved (CC BY), uploaded by Dominic · cc-by
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyParamecium, Diatom, Aquatic Bacteria
Predators
  • Water Flea
  • Copepod
  • Rotifer
ThreatsChemical water pollution, acidification, and toxic agricultural runoff
HabitatsFreshwater ponds, marshes, and slow-moving streams with rich organic sediment
Life spanPotentially indefinite through continuous binary fission (cell cycle spans days to weeks)
Classification
  1. OrderAmoebida
  2. FamilyAmoebidae
  3. GenusAmoeba
  4. SpeciesAmoeba proteus
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Harmless to humans; safe to observe at a normal distance or under a microscope.
Responsible observation
  • Microscope Viewing: Prepare a wet mount slide from bottom pond sediment and scan under low magnification.
  • Contrast Adjustment: Stop down the microscope condenser diaphragm slightly to better define the clear cytoplasm.
  • Laboratory Culturing: Maintain in shallow spring water dishes seeded with cracked wheat grains to support bacterial prey.
Related species
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