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Related Experiment Video

Updated: Jun 18, 2026

Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis
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Published on: March 16, 2014

Higher-level crustacean phylogeny: consensus and conflicting hypotheses.

Ronald A Jenner1

  • 1Department of Zoology, The Natural History Museum, Cromwell Road, London, UK. r.jenner@nhm.ac.uk

Arthropod Structure & Development
|December 1, 2009
PubMed
Summary

Crustacean phylogeny remains unresolved, with conflicting evidence from morphological and molecular studies. Further research requires broader taxon sampling and new molecular markers to clarify arthropod evolution.

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Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group
07:49

Creating and Applying a Reference to Facilitate the Discussion and Classification of Proteins in a Diverse Group

Published on: August 16, 2017

Area of Science:

  • Zoology
  • Evolutionary Biology
  • Phylogenetics

Background:

  • Higher-level crustacean phylogeny is crucial for understanding arthropod body plan evolution.
  • Existing hypotheses are based on morphological, molecular, and combined evidence, but significant conflicts persist.

Purpose of the Study:

  • To provide an overview of current hypotheses on higher-level crustacean phylogeny.
  • To identify areas of phylogenetic uncertainty and guide future research efforts.

Main Methods:

  • Review and synthesis of recent phylogenetic analyses (morphological, molecular, combined).
  • Estimation of phylogenetic uncertainty using alternative sister group hypotheses for major taxa.

Main Results:

  • Crustacean phylogeny remains largely unresolved, with widespread conflict between different evidence types.
  • The phylogenetic positions of Malacostraca, Branchiopoda, and Hexapoda are particularly problematic.
  • Discrepancies between molecular and morphological data hinder robust phylogenetic conclusions.

Conclusions:

  • Resolving crustacean phylogeny is essential for understanding arthropod evolution, especially with Hexapoda likely nested within Crustacea.
  • Future progress necessitates broader taxon sampling in molecular studies and exploration of new markers.
  • Continued revision and expansion of morphological datasets are critical due to ongoing data conflicts.