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. More recent works, however, classify the species separately in the subgenus Paraleptuca or subgenus Austruca.
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.
- 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.
- "Uca mjoebergi". Fiddler Crabs (Genus Uca). fiddlercrab.info. May 17, 2007. Italic or bold markup not allowed in:
- J. Crane (1975). Fiddler Crabs of the World (Ocypodidae: Genus Uca). Princeton, New Jersey: Princeton University Press. ISBN 0-691-08102-6.
- Peter Davie (2011). "Uca (Austruca) mjoebergi Rathbun, 1924". World Register of Marine Species. Retrieved July 18, 2011.
- 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.
- 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.