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Diversity of Protists III01:27

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 I01:15

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 II01:27

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...
Overview of Protists01:27

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 IV01:27

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...
Deep Sea Microbial Ecology01:18

Deep Sea Microbial Ecology

The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches extending beyond...

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Updated: May 31, 2026

Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis
10:55

Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis

Published on: March 16, 2014

Rotifers: exquisite metazoans.

Robert Lee Wallace1

  • 1Department of Biology, Ripon College, Ripon, Wisconsin 54971.

Integrative and Comparative Biology
|June 29, 2011
PubMed
Summary
This summary is machine-generated.

Rotifers are tiny, bilaterally symmetrical animals with a unique corona and jaws. Their ecological importance and ease of culture make them fascinating subjects for further research.

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Area of Science:

  • Zoology
  • Invertebrate Biology
  • Microbiology

Background:

  • Rotifers are a phylum of small, bilaterally symmetrical metazoans.
  • Traditionally classified within pseudocoelomates or Aschelminthes.
  • They exhibit a saccate to cylindrical body shape with three distinct regions: corona, trunk, and foot.

Purpose of the Study:

  • To highlight the rich diversity within the phylum Rotifera.
  • To underscore the ecological significance of rotifers.
  • To emphasize the ease of culturing rotifers, including using chemostat technology.

Main Methods:

  • General morphological and ecological characterization of rotifers.
  • Review of traditional classification and modern understanding.
  • Discussion of culturing techniques.

Main Results:

  • Rotifers possess a ciliated anterior corona for locomotion and feeding.
  • A complex set of jaws is characteristic of the rotifer pharynx.
  • Despite generalizations, rotifers display significant diversity.

Conclusions:

  • Rotifers are ecologically important and easily cultured organisms.
  • Further research into the diverse phylum Rotifera is warranted.
  • The study of rotifers offers unique opportunities due to remaining unknowns.