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Related Concept Videos

Diversity of Protists II01:27

Diversity of Protists II

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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...
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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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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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Related Experiment Video

Updated: Nov 21, 2025

Fluorescent In Situ Hybridization and 5-Ethynyl-2'-Deoxyuridine Labeling for Stem-Like Cells in the Hydrozoan Jellyfish Cladonema pacificum
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Learning in Cnidaria: A systematic review.

Ken Cheng1

  • 1Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia. ken.cheng@mq.edu.au.

Learning & Behavior
|January 13, 2021
PubMed
Summary
This summary is machine-generated.

Cnidaria, including jellyfish and sea anemones, exhibit non-associative learning like habituation. Some evidence suggests associative learning, like classical conditioning, may occur in sea anemones, offering insights into early cognition.

Keywords:
Classical conditioningHabituationHydraJellyfishSea anemonesSensitization

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Area of Science:

  • Zoology
  • Neuroscience
  • Evolutionary Biology

Background:

  • Cnidaria (jellyfish, corals, sea anemones) possess nerve nets, offering insights into early nervous system evolution.
  • Understanding Cnidarian cognition informs the evolution of nervous systems and cognition in bilaterian animals.

Purpose of the Study:

  • To systematically review literature on non-associative and associative learning in Cnidaria.
  • To identify knowledge gaps regarding learning in specific Cnidarian groups like corals and box jellies.

Main Methods:

  • Systematic literature search using the Web of Science database.
  • Analysis of studies focusing on habituation, sensitization, and associative learning in Cnidaria.

Main Results:

  • Habituation is well-documented in hydras, jellyfish, and sea anemones.
  • Sensitization is detailed in sea anemones, including neurobiological aspects of prey capture.
  • Limited but suggestive evidence exists for classical conditioning in sea anemones.

Conclusions:

  • Cnidaria demonstrate basic learning capabilities, particularly habituation.
  • Associative learning in sea anemones warrants further investigation, especially concerning embodied cognition and representation in brainless animals.