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(13 total)

Actinoptychus heliopelta
Actinoptychus heliopelta
© 1995 UCMP

Sceptroneis caduceus
Sceptroneis caduceus
© 1995 UCMP

© 0 Ron Stanwood

What are Protists? The term “protist” refers to any eukaryote that is not a plant, animal, or fungus. Most protists are unicellular, while others are multicellular or even multinucleate (many nuclei in one cell). Some live as single individuals, others as colonies. This diverse group exhibits a wide variety of sizes, shapes, life cycles, habitats, and feeding and reproductive strategies. The protists have a long, although in some cases patchy, fossil record stretching back to the Precambrian.

First known fossil occurrence: Precambrian.

Last known fossil occurrence: Quaternary. This group has living relatives.

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