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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,...
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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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The Fossil Record02:56

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Related Experiment Video

Updated: Jun 1, 2026

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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Published on: May 7, 2016

Polychaete chaetae: Function, fossils, and phylogeny.

Rachel A Merz1, Sarah A Woodin

  • 1Department of Biology, Swarthmore College Swarthmore, PA 19081, USA.

Integrative and Comparative Biology
|June 16, 2011
PubMed
Summary

Polychaete worms

Area of Science:

  • Marine biology
  • Zoology
  • Evolutionary biology

Background:

  • Polychaetes are a diverse class of annelid worms.
  • Chaetae are bristle-like structures found on polychaetes, with varied forms and functions.
  • Understanding chaetal evolution is key to polychaete phylogeny.

Purpose of the Study:

  • To review the phylogenetic distribution of polychaete chaetal types.
  • To discuss the functional roles of chaetae in extant polychaetes.
  • To examine the evolutionary history of chaetae using fossil evidence.

Main Methods:

  • Literature review of phylogenetic studies on Polychaeta.
  • Analysis of functional morphology of chaetae in living polychaetes.
  • Examination of fossil records for evidence of chaetal evolution.

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Last Updated: Jun 1, 2026

Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton

Published on: May 7, 2016

A Protocol for Bioinspired Design: A Ground Sampler Based on Sea Urchin Jaws
09:10

A Protocol for Bioinspired Design: A Ground Sampler Based on Sea Urchin Jaws

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Characterization of Calcification Events Using Live Optical and Electron Microscopy Techniques in a Marine Tubeworm

Published on: February 28, 2017

Main Results:

  • Chaetal types show distinct phylogenetic distributions within Polychaeta.
  • Chaetae have diverse functions including locomotion, feeding, and defense.
  • The fossil record provides insights into the early evolution and diversification of chaetae.

Conclusions:

  • Chaetae are valuable characters for polychaete phylogenetic analyses.
  • Caution is advised when interpreting chaetal data in phylogenetics.
  • Standardized methods for chaetal character analysis can enhance phylogenetic signal.