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Unpouching Peracarida relationships with ultraconserved elements.

Tammy Iwasa-Arai1, Katrin Linse2, Sónia C S Andrade3

  • 1Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil; Museum of Comparative Zoology, Department of Organismic & Evolutionary Biology, Harvard University, Cambridge, MA, United States.

Molecular Phylogenetics and Evolution
|December 18, 2025
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Summary
This summary is machine-generated.

This study uses ultraconserved elements (UCEs) to build a phylogenomic framework for Peracarida crustaceans. It resolves higher-level relationships, confirming Peracarida monophyly and the Mancoida clade.

Keywords:
CrustaceaMalacostracaPancrustaceaPhylogenomics

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Area of Science:

  • Crustacean biology
  • Evolutionary biology
  • Phylogenomics

Background:

  • Peracarida is a diverse crustacean group with complex evolutionary relationships.
  • Previous studies have disputed the higher-level relationships within Peracarida.
  • Limited research has utilized extensive taxon sampling with modern genetic approaches.

Purpose of the Study:

  • To investigate the higher-level phylogenetic relationships within Peracarida.
  • To establish a robust phylogenomic framework for Peracarida using novel genetic markers.
  • To resolve long-standing questions in malacostracan evolution.

Main Methods:

  • Development of a novel probe set of ultraconserved elements (UCEs) for peracarids.
  • Phylogenomic analyses using concatenated and coalescent-based methods.
  • Inclusion of newly collected Antarctic material and existing collection specimens.

Main Results:

  • Strong support for the monophyly of Peracarida and the clade Mancoida (Isopoda + Tanaidacea + Cumacea).
  • Thermosbaenacea consistently resolved as the sister group to all other peracarids.
  • New insights into Amphipoda relationships, placing Corophiida and Hyperiidea as early-branching lineages.
  • Monophyly of Isopoda, with Oniscidea consistent with morphological data.

Conclusions:

  • The study provides one of the first phylogenomic frameworks for Peracarida.
  • Ultraconserved elements (UCEs) are effective for resolving deep evolutionary relationships in crustaceans.
  • The findings offer significant advancements in understanding malacostracan evolution.