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The prevalence of male right handedness in the indo west pacific fiddler crabs uca vocans and uca tetragonon decapoda ocypodidae

, : The prevalence of male right handedness in the indo west pacific fiddler crabs uca vocans and uca tetragonon decapoda ocypodidae. Journal of Crustacean Biology 2(1): 70-83

Right-handedness of the major cheliped was found in 97.3% of 2784 male specimens of U. vocans from collections of the National Museum of Natural History (USA National Museum) and the 1979 RV ALPHA HELIX expeditions to the western Pacific. A comparable figure of 96.8% right-handedness was obtained for 281 specimens of the rarer U. tetragonon. Since the collections span the known geographical ranges of both species, it would appear that a strong bias for right-handedness is a universal trait for each. The 2 spp. are thus an exception to the right-left equality of handedness previously thought to prevail for the genus. Recently published studies provide possible clues to the mechanism for the determination of right handedness and its functional significance.

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