Pancrustacean evolution illuminated by taxon-rich genomic-scale data sets with an expanded remipede sampling

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  • Jesus Lozano-Fernandez, School of Earth Sciences, University of Bristol, United Kingdom.
  • ,
  • Mattia Giacomelli, School of Biological Sciences, University of Bristol, United Kingdom.
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  • James Fleming, School of Earth Sciences, University of Bristol, United Kingdom.
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  • Albert Chen, School of Earth Sciences, University of Bristol, United Kingdom.
  • ,
  • Jakob Vinther, School of Earth Sciences, University of Bristol, United Kingdom.
  • ,
  • Philip Francis Thomsen
  • Henrik Glenner, Department of Biology, University of Bergen, Bergen, Norway; Sars International Centre, Uni Research, University of Bergen, Bergen, Norway.
  • ,
  • Ferran Palero, Faculty of Biology and Environmental Protection, University of Lodz, Poland.
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  • David A Legg, Department of Earth, Atmospheric, and Environmental Sciences, University of Manchester, United Kingdom.
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  • Thomas M Iliffe, Department of Marine Biology, Texas A&M University at Galveston, USA.
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  • Davide Pisani, School of Earth Sciences, University of Bristol, United Kingdom.
  • ,
  • Jørgen Olesen, Department of Biology, University of Bergen, Bergen, Norway; Sars International Centre, Uni Research, University of Bergen, Bergen, Norway.

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 prioritised 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 (="non-marine 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.

OriginalsprogEngelsk
TidsskriftGenome Biology and Evolution
ISSN1759-6653
DOI
StatusE-pub ahead of print - 4 jul. 2019

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