Eubrachyura

Eubrachyura
Temporal range: Cretaceous–Recent
Liocarcinus vernalis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
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 advanced 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 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.
  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.
  3. ↑ https://gsa.confex.com/gsa/2012AM/finalprogram/abstract_212659.htm
  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.

External links