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Diversity of Protists IV

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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...

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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...

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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,...

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Related Experiment Video

Updated: May 13, 2026

Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches

Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches

Published on: October 27, 2013

The Amoebozoa.

Christina Schilde¹, Pauline Schaap

¹College of Life Sciences, University of Dundee, Dundee, UK.

Methods in Molecular Biology (Clifton, N.J.)

|March 16, 2013

Summary

Dictyostelium discoideum, a model organism, belongs to the Amoebozoa. This study explores Amoebozoan diversity and the evolution of multicellularity, proposing a stress-response model for Dictyostelid evolution.

Area of Science:

Eukaryotic diversity
Protist evolution
Amoebozoa biology

Background:

Dictyostelium discoideum is a key model organism within the Amoebozoa.
Amoebozoa represent a major eukaryotic division with diverse unicellular forms.
Understanding their evolutionary paths is crucial for comprehending eukaryotic complexity.

Purpose of the Study:

To provide an overview of Amoebozoan diversity.
To compare evolutionary pathways to multicellularity in Amoebozoa with other protists.
To propose a model for the evolution of Dictyostelid multicellularity.

Main Methods:

Comparative analysis of Amoebozoan diversity.
Review of evolutionary strategies towards multicellularity in protists.

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Development of a hypothetical scenario for Dictyostelid multicellularity.

Main Results:

Amoebozoa exhibit significant diversity in morphology, lifestyle, and behavior.
Multiple independent origins of multicellularity are observed across protist lineages.
A stress-response mechanism is proposed as a driver for Dictyostelid multicellular evolution.

Conclusions:

Amoebozoan diversity provides a rich context for studying eukaryotic evolution.
Multicellularity has evolved convergently in various protist groups.
Dictyostelid multicellularity likely arose from an adaptive response to environmental stress.