Xenocarida Explained

Xenocarida (from the Greek for strange shrimp) is a proposed clade inside the subphylum Crustacea that comprises two classes that were discovered in the 20th century: Remipedia and Cephalocarida. Both groups are marine hermaphrodites.^{[1] [2]} The clade was recovered as the sister groups to Hexapoda (including insects).^[3]

However, other studies do not recover Xenocarida as a monophyletic group^{[4] [5]} and variously find Branchiopoda or Remipedia as the hexapod sister group^{[6] [7] [4] [5]}

Notes and References

1. Book: The Insects: An Outline of Entomology . 9781118846155 . Gullan . P. J. . Cranston . P. S. . 3 November 2014 . John Wiley & Sons .
2. Book: The Evolution of Primary Sexual Characters in Animals . 978-0-19-971703-3 . Leonard . Janet . Cordoba-Aguilar . Alex . 16 July 2010 . Oxford University Press .
3. Jerome C. Regier . Jeffrey W. Shultz . Andreas Zwick . April Hussey . Bernard Ball . Regina Wetzer . Joel W. Martin . Clifford W. Cunningham . amp . 2010 . Arthropod relationships revealed by phylogenomic analysis of nuclear protein-coding sequences . . 463 . 7284. 1079–1083 . 10.1038/nature08742 . 20147900. 2010Natur.463.1079R . 4427443 .
4. 10.1093/molbev/mss216. Phylotranscriptomics to Bring the Understudied into the Fold: Monophyletic Ostracoda, Fossil Placement, and Pancrustacean Phylogeny . 2013 . Oakley . Todd H. . Wolfe . Joanna M. . Lindgren . Annie R. . Zaharoff . Alexander K. . Molecular Biology and Evolution . 30 . 215–233 . 22977117 . free .
5. 10.1016/j.cub.2017.05.040 . A Phylogenomic Solution to the Origin of Insects by Resolving Crustacean-Hexapod Relationships . 2017 . Schwentner . Martin . Combosch . David J. . Pakes Nelson . Joey . Giribet . Gonzalo . Current Biology . 27 . 12 . 1818–1824.e5 . 28602656 . 38457877 . free .
6. David R. Andrew . 2011 . A new view of insect–crustacean relationships II. Inferences from expressed sequence tags and comparisons with neural cladistics . . 40 . 3 . 289–302 . 10.1016/j.asd.2011.02.001 . 21315832.
7. Bjoern M. von Reumont . Ronald A. Jenner . Matthew A. Wills . Emiliano Dell'Ampio . Günther Pass . Ingo Ebersberger . Benjamin Meyer . Stefan Koenemann . Thomas M. Iliffe . Alexandros Stamatakis . Oliver Niehuis . Karen Meusemann . Bernhard Misof . amp . 2012 . Pancrustacean phylogeny in the light of new phylogenomic data: support for Remipedia as the possible sister group of Hexapoda . . 29 . 3 . 1031–1045 . 10.1093/molbev/msr270 . 22049065 . PDF proofs. free .