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Phylum Tardigrada: an "individual" approach.

Chester J Sands1, Sandra J McInnes1, Nigel J Marley2

  • 1Natural Environment Research Council, British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK.

Cladistics : the International Journal of the Willi Hennig Society
|December 11, 2021
PubMed
Summary
This summary is machine-generated.

This study re-evaluates tardigrade (Phylum Tardigrada) taxonomy using molecular data, revealing new super-families within Order Parachela and challenging existing classifications in Eutardigrada due to conserved morphology.

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Area of Science:

  • Zoology
  • Evolutionary Biology
  • Genomics

Background:

  • Tardigrada (water bears) are diverse, hardy metazoans with debated phylogenetic placement within Ecdysozoa.
  • Previous phylogenetic studies were limited by scarce morphological characters and low DNA yields in tardigrades.

Purpose of the Study:

  • To investigate the evolutionary relationships and taxonomy of Tardigrada using molecular data.
  • To address limitations in previous tardigrade phylogenetic analyses by employing a new DNA extraction protocol.

Main Methods:

  • Sequencing of 18S ribosomal DNA (rDNA) from 343 tardigrade individuals globally.
  • Phylogenetic analyses using maximum parsimony and Bayesian inference.

Main Results:

  • Support for dividing the Order Parachela into three distinct superfamilies.
  • Evidence suggesting that traditional families within the class Eutardigrada are non-monophyletic and require revision.
  • Identification of conserved morphology leading to potentially oversimplified genus classifications, with several distinct lineages grouped together.

Conclusions:

  • The study substantially enhances understanding of tardigrade evolution and taxonomy.
  • Current taxonomic classifications, particularly within Eutardigrada, need re-evaluation due to molecular evidence.
  • Future research incorporating unsampled taxa will further refine these phylogenetic inferences.