Biology:Crabs of the British Isles

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Largest and smallest crabs of the British Isles
Paromola cuvieri (up to 120 cm claw span)
Pinnotheres pisum (up to 4 mm across the carapace)

Around 65 species of crab occur in the waters of the British Isles.[1][Note 1] All are marine, with the exception of the introduced Chinese mitten crab, Eriocheir sinensis, which occurs in fresh and brackish water. They range in size from the deep-water species Paromola cuvieri,[3] which can reach a claw span of 1.2 metres (3 ft 11 in),[4] to the pea crab, which is only 4 mm (0.16 in) wide and lives inside mussel shells.

Fisheries

Commercial crabs in the British Isles
Nearly 30,000 t of the edible crab Cancer pagurus is landed in the British Isles every year.
1,500 t of the spider crab Maja brachydactyla is landed in the British Isles every year.
More than 500 t of the shore crab, Carcinus maenas, is landed in the British Isles every year.
Up to 200 t of the velvet crab, Necora puber, is landed in the British Isles every year.

Several species of wild crab are the subject of crab fisheries around the coasts of the British Isles. The most important are the brown crab or edible crab, Cancer pagurus (29,193 t), various swimming crabs (3,180 t), the spider crab Maja brachydactyla (1,565 t), the shore crab or green crab Carcinus maenas (553 t) and the velvet crab Necora puber (193 t). Around 77% of the catch is landed in the United Kingdom, 19% in Ireland, 4% in the Channel Islands, and 1% in the Isle of Man.[Note 2]

Species

62 species have been directly observed in the waters of the British Isles:[1][Note 3]

Dromiidae
Homolidae
Leucosiidae
  • Ebalia cranchii Leach, 1817
  • Ebalia granulosa H. Milne-Edwards, 1837
  • Ebalia nux A. Milne-Edwards, 1883
  • Ebalia tuberosa (Pennant, 1777)
  • Ebalia tumefacta (Montagu, 1808)
Majidae
Oregoniidae
Inachidae
  • Achaeus cranchii Leach, 1817
  • Inachus dorsettensis (Pennant, 1777)
  • Inachus leptochirus Leach, 1817
  • Inachus phalangium (Fabricius, 1775)
  • Macropodia deflexa Forest, 1978
  • Macropodia linaresi Forest & Zariquiey Alvarez, 1964
  • Macropodia rostrata (Linnaeus, 1761)
  • Macropoda tenuirostris (Leach, 1814)
Epialtidae
  • Pisa armata (Latreille, 1803)
  • Pisa tetraodon (Pennant, 1777)
Parthenopidae
  • Parthenopides massena (Roux, 1830)
Corystidae
  • Corystes cassivelaunus (Pennant, 1777)
Atelecyclidae
Thiidae
Pirimelidae
  • Pirimela denticulata (Montagu, 1808)
Cancridae
Portunidae
Geryonidae
Goneplacidae
Xanthidae
  • Monodaeus couchi (Couch, 1851)
  • Xantho hydrophilus (Herbst, 1790)
  • Xantho pilipes A. Milne-Edwards, 1867
Panopeidae
Pilumnoididae
Pilumnidae
Grapsidae
Varunidae
Pinnotheridae


Three deep-water species have also been recorded near the British Isles, and are likely to occur in the area. These are:[1]

  • Cymonomus granulatus (Norman in Wyville Thomson, 1873) (Cymonomidae)
  • Dorhynchus thomsoni Wyville Thomson, 1873 (Inachidae)
  • Rochinia carpenteri (Wyville Thomson, 1873) (Epialtidae)

Notes

  1. ↑ Howson & Picton define the waters of the British Isles to be the area within the 200 metres (660 ft) isobath surrounding the British Isles, between 48 °N and 62.5 °N, and between 13 °W and 6 °E; this includes the English Channel and parts of the North Sea coasts of Belgium and the Netherlands, but excludes the Faroe Islands.[2]
  2. ↑ Fishery data is for the year 2009, and is taken from the FAO's online database, summing the captures for the Channel Islands, Isle of Man, Ireland and the United Kingdom .[5]
  3. ↑ Nomenclature follows Ng et al. (2009).[6]

References

  1. ↑ 1.0 1.1 1.2 J. M. C. Holmes; M. J. Costello; D. W. Connor (1997). "Crustacea". in Christine M. Howson. The Species Directory of the Marine Fauna and Flora of the British Isles and Surrounding Seas. Ulster Museum and the Marine Conservation Society. pp. 142–209. ISBN 978-0-948150-06-7. http://www.vliz.be/imisdocs/publications/68694.pdf. 
  2. ↑ Christine M. Howson, ed (1997). "Introduction". The Species Directory of the Marine Fauna and Flora of the British Isles and Surrounding Seas. Ulster Museum and the Marine Conservation Society. pp. 5–8. ISBN 978-0-948150-06-7. http://www.vliz.be/imisdocs/publications/68694.pdf. 
  3. ↑ Michael McCarthy (April 22, 2010). "Britain's biggest crab emerges from the deep". The Independent. https://www.independent.co.uk/environment/nature/britains-biggest-crab-emerges-from-the-deep-1950684.html. Retrieved February 12, 2012. 
  4. ↑ Mike Thurston (1987). "Record breaking crab is not such a strange catch". New Scientist 114 (1554): 24. https://books.google.com/books?id=UcHQ3BIGfHMC&pg=PA24. 
  5. ↑ "Global Capture Production 1950–2009". Food and Agriculture Organization. http://www.fao.org/fishery/statistics/global-capture-production/query/en. Retrieved February 12, 2012. 
  6. ↑ Peter K. L. Ng; Danièle Guinot; Peter J. F. Davie (2008). "Systema Brachyurorum: Part I. An annotated checklist of extant Brachyuran crabs of the world". Raffles Bulletin of Zoology 17: 1–286. Archived from the original on 2011-06-06. https://web.archive.org/web/20110606061453/http://rmbr.nus.edu.sg/rbz/biblio/s17/s17rbz.pdf. 



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