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Overview of Protists

Overview of Protists

Protists are diverse eukaryotic microorganisms that lack the specialized tissues of plants and animals and the chitinous cell walls of fungi. Their early divergence within Eukarya resulted in structural, functional, and ecological diversity. They are classified into supergroups such as Archaeplastida, Excavata, Amoebozoa, Rhizaria, Alveolata, and Stramenopiles, determined through genetic analysis and structural similarities.Structural and Functional AdaptationsProtists have various adaptations...

Diversity of Protists II

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...

Diversity of Protists I

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...

Diversity of Protists III

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

Diversity of Protists IV

Diversity of Protists IV

Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...

Predator-Prey Interactions

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.

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Updated: Dec 21, 2025

Fluorescently Labeled Bacteria as a Tracer to Reveal Novel Pathways of Organic Carbon Flow in Aquatic Ecosystems

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Published on: September 13, 2019

Predatory protists.

Brian S Leander¹

¹Departments of Botany and Zoology, Biodiversity Research Centre, 6270 University Boulevard, University of British Columbia, Vancouver, BC, V6T 1Z4, Canada.

Current Biology : CB

|May 20, 2020

Summary

Predatory protists, single-celled eukaryotes that consume other cells via phagocytosis, are crucial for understanding the evolution of complex life. This primer explores their predatory lifestyles and their role in enabling endosymbiosis.

Area of Science:

Microbiology
Evolutionary Biology
Cell Biology

Background:

Protists constitute the majority of eukaryotic life.
Predatory lifestyles are common among protists.
Phagocytosis is a key cellular process.

Purpose of the Study:

To introduce predatory protists and their ecological roles.
To explain the significance of phagocytosis in protist predation.
To highlight the link between protist predation, endosymbiosis, and cellular evolution.

Main Methods:

Literature review and synthesis of existing research.
Conceptual framework development.
Explanatory narrative.

Main Results:

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Live-Cell Imaging of the Life Cycle of Bacterial Predator Bdellovibrio bacteriovorus using Time-Lapse Fluorescence Microscopy

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Fluorescently Labeled Bacteria as a Tracer to Reveal Novel Pathways of Organic Carbon Flow in Aquatic Ecosystems

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Assaying Predatory Feeding Behaviors in Pristionchus and Other Nematodes

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Live-Cell Imaging of the Life Cycle of Bacterial Predator Bdellovibrio bacteriovorus using Time-Lapse Fluorescence Microscopy

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Published on: May 8, 2020

Predatory protists utilize phagocytosis to engulf prey.
Phagocytosis by protists is a prerequisite for endosymbiotic events.
This predatory lifestyle facilitated the evolution of complex eukaryotic cells.

Conclusions:

Predatory protists are fundamental to understanding eukaryotic evolution.
The evolution of complex cells is intrinsically linked to phagocytosis and endosymbiosis.
Further research into protist predation offers insights into major evolutionary transitions.