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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...
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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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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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Developmental mode influences diversification in ascidians.

Max E Maliska1, Matthew W Pennell, Billie J Swalla

  • 1Department of Biology, University of Washington, , 24 Kincaid Hall, Seattle, WA 98195, USA. mem24@uw.edu

Biology Letters
|April 5, 2013
PubMed
Summary
This summary is machine-generated.

Ascidian speciation rates are linked to larval development. Tailed, hatching larvae correlate with larger ranges and higher speciation, while tailless larvae show the opposite trend.

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Area of Science:

  • Marine Biology
  • Evolutionary Biology
  • Zoology

Background:

  • Ascidians (Tunicata: Ascidiacea) typically exhibit tadpole larvae with tails for dispersal.
  • Some ascidian lineages have evolved tailless larvae, impacting dispersal and metamorphosis timing.
  • Larval morphology varies significantly across ascidian species, influencing their ecological strategies.

Purpose of the Study:

  • To investigate the relationship between ascidian larval development modes and speciation rates.
  • To determine if larval development influences geographical range sizes in ascidians.
  • To compare diversification patterns in ascidians with those observed in other marine invertebrates.

Main Methods:

  • Phylogenetic analysis of diversification in binary characters across a distribution of trees.
  • Statistical modeling to assess the correlation between larval type (tailed vs. tailless) and range size.
  • Comparative analysis of speciation rates across different ascidian lineages based on larval morphology.

Main Results:

  • Ascidian species with tailed, hatching larvae exhibit higher speciation rates and larger geographical ranges.
  • Species with tailless, non-hatching larvae demonstrate lower speciation rates and smaller geographical ranges.
  • Mode of larval development was found to be a significant predictor of geographical range size.

Conclusions:

  • Larval dispersal capability, as indicated by morphology, is a key factor shaping ascidian diversification.
  • The findings suggest a link between life history traits and macroevolutionary patterns in marine invertebrates.
  • Discrepancies with sea urchin and snail data highlight the need for further research into invertebrate diversification.