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'''Eubrachyura''' is a group of [[crustacean]]s ([[taxonomic rank|ranked]] as a "section") comprising the more derived [[crab]]s. 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 [[arthropod leg|legs]] in the males, but on the [[Sternum (arthropod)|sternum]] in females, while in the [[Thoracotremata]], the openings are on the sternum in both sexes. This contrasts with the situation in other [[Decapoda|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 crab]]s ([[Gecarcinucoidea]], [[Potamoidea]]).<ref name="Ng">{{cite journal|journal=[[Raffles Bulletin of Zoology]] |year=2008 |volume=17 |pages=1–286 |title=Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world |author=P. K. L. Ng, [[Danièle Guinot|D. Guinot]] & P. J. F. Davie |url=http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |deadurl=yes |archiveurl=https://web.archive.org/web/20110606061453/http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |archivedate=2011-06-06 |df= }}</ref> The [[fossil record]] of Eubrachyura extends back to the [[Cretaceous]];<ref>https://gsa.confex.com/gsa/2012AM/webprogram/Paper212659.html</ref> the supposed [[Bathonian]] ([[Middle Jurassic]]) representative of the group, ''[[Hebertides jurassica]]'',<ref>{{cite journal |title=''Hebertides jurassica'' n. gen., n. sp. (Crustacea, Decapoda, Brachyura) from the Middle Jurassic (Bathonian) of Normandy (France) |author1=Danièle Guinot |author2=Antonio de Angeli |author3=Alessandro Garassino |journal=[[Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano]] |year=2007 |volume=148 |issue=2 |pages=241–260}}</ref> ultimately turned out to be [[Cenozoic]] in age.<ref>{{cite journal |title=The Cenozoic age of the supposed Jurassic crab ''Hebertides jurassica'' Guinot, De Angeli & Gerassino, 2007 (Crustacea, Decapoda, Brachyura) |author1=Paul D. Taylor |author2=G. Breton |author3=Danièle Guinot |author4=Antonio de Angeli |author5=Alessandro Garassino |journal=[[Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano]] |year=2012 |volume=153 |issue=1 |pages=71–83 |doi=10.4081/nhs.2012.71 }}</ref>
'''Eubrachyura''' is a group of [[crustacean]]s ([[taxonomic rank|ranked]] as a "section") comprising the more derived [[crab]]s. 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 [[arthropod leg|legs]] in the males, but on the [[Sternum (arthropod)|sternum]] in females, while in the [[Thoracotremata]], the openings are on the sternum in both sexes. This contrasts with the situation in other [[Decapoda|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 crab]]s ([[Gecarcinucoidea]], [[Potamoidea]]).<ref name="Ng">{{cite journal|journal=[[Raffles Bulletin of Zoology]] |year=2008 |volume=17 |pages=1–286 |title=Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world |author=P. K. L. Ng, [[Danièle Guinot|D. Guinot]] & P. J. F. Davie |url=http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |deadurl=yes |archiveurl=https://web.archive.org/web/20110606061453/http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf |archivedate=2011-06-06 |df= }}</ref> The [[fossil record]] of the Eubrachyura extends back to the [[Cretaceous]];<ref>https://gsa.confex.com/gsa/2012AM/webprogram/Paper212659.html</ref> the supposed [[Bathonian]] ([[Middle Jurassic]]) representative of the group, ''[[Hebertides jurassica]]'',<ref>{{cite journal |title=''Hebertides jurassica'' n. gen., n. sp. (Crustacea, Decapoda, Brachyura) from the Middle Jurassic (Bathonian) of Normandy (France) |author1=Danièle Guinot |author2=Antonio de Angeli |author3=Alessandro Garassino |journal=[[Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano]] |year=2007 |volume=148 |issue=2 |pages=241–260}}</ref> ultimately turned out to be [[Cenozoic]] in age.<ref>{{cite journal |title=The Cenozoic age of the supposed Jurassic crab ''Hebertides jurassica'' Guinot, De Angeli & Gerassino, 2007 (Crustacea, Decapoda, Brachyura) |author1=Paul D. Taylor |author2=G. Breton |author3=Danièle Guinot |author4=Antonio de Angeli |author5=Alessandro Garassino |journal=[[Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano]] |year=2012 |volume=153 |issue=1 |pages=71–83 |doi=10.4081/nhs.2012.71 }}</ref>


==References==
==References==

Revision as of 00:37, 5 April 2019

Eubrachyura
Temporal range: Cretaceous–Recent
Liocarcinus vernalis
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Malacostraca
Order: Decapoda
Suborder: Pleocyemata
Infraorder: Brachyura
Section: Eubrachyura
de Saint Laurent, 1980
Subsections [1]

Eubrachyura is a group of 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).[2] The fossil record of the Eubrachyura extends back to the Cretaceous;[3] the supposed Bathonian (Middle Jurassic) representative of the group, Hebertides jurassica,[4] ultimately turned out to be Cenozoic in age.[5]

References

  1. ^ Sammy De Grave; N. Dean Pentcheff; Shane T. Ahyong; et al. (2009). "A classification of living and fossil genera of decapod crustaceans" (PDF). Raffles Bulletin of Zoology. Suppl. 21: 1–109. Archived from the original (PDF) on 2011-06-06. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  2. ^ P. K. L. Ng, D. Guinot & P. J. F. Davie (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world" (PDF). Raffles Bulletin of Zoology. 17: 1–286. Archived from the original (PDF) on 2011-06-06. {{cite journal}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  3. ^ https://gsa.confex.com/gsa/2012AM/webprogram/Paper212659.html
  4. ^ Danièle Guinot; Antonio de Angeli; Alessandro Garassino (2007). "Hebertides jurassica n. gen., n. sp. (Crustacea, Decapoda, Brachyura) from the Middle Jurassic (Bathonian) of Normandy (France)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 148 (2): 241–260.
  5. ^ Paul D. Taylor; G. Breton; Danièle Guinot; Antonio de Angeli; Alessandro Garassino (2012). "The Cenozoic age of the supposed Jurassic crab Hebertides jurassica Guinot, De Angeli & Gerassino, 2007 (Crustacea, Decapoda, Brachyura)". Atti della Società italiana di scienze naturali e del museo civico di storia naturale di Milano. 153 (1): 71–83. doi:10.4081/nhs.2012.71.


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