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Cyanagraea praedator
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Decapoda
Infraorder: Brachyura
Family: Bythograeidae
Genus: Cyanagraea
de Saint Laurent, 1984
Species: C. praedator
Binomial name
Cyanagraea praedator
de Saint Laurent, 1984

Cyanagraea praedator is a species of crab that lives on hydrothermal vents, and the only species in the genus Cyanagraea.[1][2]

It is found at depths of 2,535–2,630 m (8,317–8,629 ft) on the East Pacific Rise,[3] where it lives "in the upper part of black smoker chimneys".[4] Its haemocyanin has a strong affinity for oxygen, and displays a significant Bohr effect, which is unaffected by lactic acid.[5]

Cyanagraea praedator is "by far the largest" species in the family Bythograeidae, growing to a maximum carapace size of 123.0 mm × 74.8 mm (4.84 in × 2.94 in).[3]

The leech Bathybdella sawyeri has been observed attached to C. praedator.[6]


  1. ^ Peter Davie (2011). "Cyanagraea Saint Laurent, 1984". World Register of Marine Species. Retrieved November 27, 2011. 
  2. ^ 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" (PDF). Raffles Bulletin of Zoology. 17: 1–286. Archived from the original (PDF) on 2011-06-06. 
  3. ^ a b Colin McLay (2007). "New crabs from hydrothermal vents of the Kermadec Ridge submarine volcanoes, New Zealand: Gandalfus gen. nov. (Bythograeidae) and Xenograpsus (Varunidae) (Decapoda: Brachyura)" (PDF). Zootaxa. 1524: 1–22. 
  4. ^ Fabienne Chausson; Christopher R. Bridges; Pierre-Marie Sarradin; Brian N. Green; Ricardo Riso; Jean-Claude Caprais; François H. Lallier (2001). "Structural and functional properties of hemocyanin from Cyanagraea praedator, a deep-sea hydrothermal vent crab". Proteins: Structure, Function, and Bioinformatics. 45 (4): 351–359. doi:10.1002/prot.10014. PMID 11746683. 
  5. ^ Stéphane Hourdez; François H. Lallier (2007). Ricardo Amils; Cynan Ellis-Evans; Helmut Hinghofer-Szalkay, eds. "Life in Extreme Environments, Part II" (PDF). Reviews in Environmental Science and Biotechnology. Springer. 6 (1–3): 143–159 [297–313]. doi:10.1007/s11157-006-9110-3. ISBN 978-1-4020-6284-1. Archived from the original (PDF) on 2012-04-06.  |chapter= ignored (help)
  6. ^ Eugene M. Burreson; Michel Segonzac (2006). "Morphological variability of Bathybdella sawyeri (Hirudinida: Piscicolidae) from hydrothermal vents on the Galápagos Rift and the South East Pacific Rise" (PDF excerpt). Zootaxa. 1286: 15–21. 

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