Eubrachyura Explained

Eubrachyura is a group of decapod crustaceans (ranked as a "section") comprising the more derived crabs. It is divided into two subsections, based on the position of the genital openings in the two sexes. In the Heterotremata, the openings are on the legs in the males, but on the sternum in females, while in the Thoracotremata, the openings are on the sternum in both sexes. This contrasts with the situation in other decapods, in which the genital openings are always on the legs. Heterotremata is the larger of the two groups, containing the species-rich superfamilies Xanthoidea and Pilumnoidea and all the freshwater crabs (Gecarcinucoidea, Potamoidea). The eubrachyura is well known for actively and constantly building its own burrows.[1] The fossil record of the Eubrachyura extends back to the Cretaceous;[2] the supposed Bathonian (Middle Jurassic) representative of the group, Hebertides jurassica,[3] ultimately turned out to be Cenozoic in age.[4]

Here is a cladogram showing Eubrachyura's placement within Brachyura, as well as the two subgroups Heterotremata and Thoracotremata:[5] [6]

Notes and References

  1. . 2008 . 17 . 1–286 . Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world . P. K. L. Ng, D. Guinot & P. J. F. Davie . dead . https://web.archive.org/web/20110606061453/http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf . 2011-06-06 .
  2. Web site: Evolution of Primitive Crabs: Insights from the Neotropics. 6 November 2012.
  3. Hebertides jurassica n. gen., n. sp. (Crustacea, Decapoda, Brachyura) from the Middle Jurassic (Bathonian) of Normandy (France) . Danièle Guinot . Antonio de Angeli . Alessandro Garassino . Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano . 2007 . 148 . 2 . 241–260.
  4. The Cenozoic age of the supposed Jurassic crab Hebertides jurassica Guinot, De Angeli & Gerassino, 2007 (Crustacea, Decapoda, Brachyura) . Paul D. Taylor . G. Breton . Danièle Guinot . Antonio de Angeli . Alessandro Garassino . Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano . 2012 . 153 . 1 . 71–83 . 10.4081/nhs.2012.71 . free .
  5. Wolfe . Joanna M. . Breinholt . Jesse W. . Crandall . Keith A. . Lemmon . Alan R. . Lemmon . Emily Moriarty . Timm . Laura E. . Siddall . Mark E. . Bracken-Grissom . Heather D. . A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans . . 24 April 2019 . 286 . 1901 . 10.1098/rspb.2019.0079 . 31014217 . 6501934 . free .
  6. Evolutionary History of True Crabs (Crustacea: Decapoda: Brachyura) and the Origin of Freshwater Crabs . Ling Ming Tsang . Christoph D. Schubart . Shane T. Ahyong . Joelle C.Y. Lai . Eugene Y.C. Au . Tin-Yam Chan . Peter K.L. Ng . Ka Hou Chu . . Oxford University Press . 31 . 5 . 2014 . 1173–1187 . 10.1093/molbev/msu068 . 24520090 . free.

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