Abstract
ABSTRACT Right-handedness of the major cheliped was found in 97.3% of 2,784 male specimens of U. vocans from collections of the National Museum of Natural History (U.S. National Museum) and the 1979 R/V 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 two species 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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