Uca mjoebergi

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Uca mjoebergi
Scientific classification
U. mjoebergi
Binomial name
Uca mjoebergi
Rathbun, 1924 [1]

Uca mjoebergi is a species of fiddler crab discovered by and named after the Swedish zoologist Eric Mjöberg (1882–1938), member of a Swedish scientific expedition to Australia in the early 1900s.

The crab is found along the north and northwest coast of Australia (approximately from Dampier to the Gulf of Carpentaria and on Papua New Guinea's northwest coast).[2]

According to Crane, the species U. mjoebergi should be classified as a subspecies of Uca lactea, which in turn is a member of the subgenus Celuca.[3] More recent works, however, classify the species separately in the subgenus Paraleptuca[1] or subgenus Austruca.[4]

Claw bluffing[edit]

Male U. mjoebergi rely heavily on their enlarged claw to signal dominance and fighting prowess. Crabs which lose their large claw will occasionally regenerate a lighter, cheaper claw (requiring less energy to produce). Research has shown that, while crabs with these 'cheap' claws are worse fighters than crabs with strong claws of a similar size, they are just as effective at intimidating other crabs based on claw size alone.[5][6]


  1. ^ a b 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.
  2. ^ "Uca mjoebergi". Fiddler Crabs (Genus Uca). fiddlercrab.info. May 17, 2007.
  3. ^ J. Crane (1975). Fiddler Crabs of the World (Ocypodidae: Genus Uca). Princeton, New Jersey: Princeton University Press. ISBN 0-691-08102-6.
  4. ^ Peter Davie (2011). "Uca (Austruca) mjoebergi Rathbun, 1924". World Register of Marine Species. Retrieved July 18, 2011.
  5. ^ British Ecological Society (November 13, 2008). "Fiddler crabs reveal honesty is not always the best policy". University of New South Wales. Retrieved November 19, 2008.
  6. ^ Simon P. Lailvaux, Leeann T. Reaney & Patricia R. Y. Backwell (2009). "Regenerated claws dishonestly signal performance and fighting ability in the fiddler crab Uca mjoebergi". Functional Ecology. 23 (2): 359–366. doi:10.1111/j.1365-2435.2008.01501.x.