Pancrustacean Evolution Illuminated by Taxon-Rich Genomic-Scale Data Sets with an Expanded Remipede Sampling

Jesus Lozano-Fernandez, Mattia Giacomelli, James F. Fleming, Albert Chen, Jakob Vinther, Philip Francis Thomsen, Henrik Glenner, Ferran Palero, David A. Legg, Thomas M. Iliffe, Davide Pisani, Jørgen Olesen

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Abstract

The relationships of crustaceans and hexapods (Pancrustacea) have been much discussed and partially elucidated following the emergence of phylogenomic data sets. However, major uncertainties still remain regarding the position of iconic taxa such as Branchiopoda, Copepoda, Remipedia, and Cephalocarida, and the sister group relationship of hexapods. We assembled the most taxon-rich phylogenomic pancrustacean data set to date and analyzed it using a variety of methodological approaches. We prioritized low levels of missing data and found that some clades were consistently recovered independently of the analytical approach used. These include, for example, Oligostraca and Altocrustacea. Substantial support was also found for Allotriocarida, with Remipedia as the sister of Hexapoda (i.e., Labiocarida), and Branchiopoda as the sister of Labiocarida, a clade that we name Athalassocarida (="nonmarine shrimps"). Within Allotriocarida, Cephalocarida was found as the sister of Athalassocarida. Finally, moderate support was found for Hexanauplia (Copepoda as sister to Thecostraca) in alliance with Malacostraca. Mapping key crustacean tagmosis patterns and developmental characters across the revised phylogeny suggests that the ancestral pancrustacean was relatively short-bodied, with extreme body elongation and anamorphic development emerging later in pancrustacean evolution.

Original languageEnglish
Pages (from-to)2055-2070
Number of pages16
JournalGenome biology and evolution
Volume11
Issue number8
Early online date4 Jul 2019
DOIs
Publication statusPublished - 1 Aug 2019

Bibliographical note

© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution.

Funding

We would like to thank two anonymous reviewers for their useful comments. J.L.-F. was supported by a Marie Skłodowska-Curie Fellowship (655814) and J.O. was supported by a grant from the Danish Agency for Science, Technology, and Innovation (0601-12345B). F.P. was supported by the grant CHALLENGEN (CTM2013-48163) from the Spanish Government and a postdoctoral contract funded by the Beatriu de Pinós Programme of the Generalitat de Catalunya (2014-BPB-00038) J.F.F. was supported by a NERC GW4+ PhD studentship and J.V. and D.P. were supported by a NERC BETR grant (NE/P013678/1). M.G. is supported by a European Marie Curie (ITN – IGNITE) PhD studentship.

Keywords

  • crustacean phylogeny
  • Dayhoff recoding
  • Pancrustacea
  • remipedes
  • transcriptomics

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics

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