Slime moulds are consumer-decomposer protists. They are fungus-like protists that feed on dead and decaying organic matter, such as rotting logs and leaves, making them important nutrient recyclers in ecosystems.

Sarcodines (Amoeboid protozoans) are mostly heterotrophic, feeding on bacteria, algae, or organic debris, but are generally not classified as primary decomposers.

Dinoflagellates are primarily photosynthetic autotrophs (producers) and sometimes mixotrophic, not decomposers.

Diatoms are photosynthetic, single-celled algae (producers) found in aquatic environments.

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