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Development of asymmetry in the claws of the fiddler crab uca lactea



Development of asymmetry in the claws of the fiddler crab uca lactea



Pakistan Journal of Zoology 10(1): 49-54



An experimental study of the regeneration of selectively removed claws of different sexual types of the fiddler crab U. lactea, showed that when large claws were removed from 26 adult asymmetrical males new similar-size large claws appeared on their original sites. Variable results were obtained from symmetrical specimens having 2 small equal-sized claws. Majority of these crabs (76) regenerated small claws, no matter which claw was removed. These were later identified as females. In 9 other young symmetrical specimens of 3.0-3.3 mm size when the right small claws were removed the counterpart claws on the left side became enlarged and vice versa. In 3 more symmetrical specimens of 4.0-4.1 mm size, when the right small claw was removed the newly regenerated right claw itself was enlarged. Artifical removal of claws had evidently induced asymmetry in these originally symmetrical specimens; whether the asymmetry induced at this size is permanent, is uncertain. In 9 supermales (which have 2 large claws) of 3.0-3.9 mm size, small claws regenerated after the removal of 1 of the 2 large claws, thereby transforming them into asymmetrical males.

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Accession: 005132622

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