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image of Crustaceana

A fifty-fifty ratio was confirmed for the left- and right-handedness of Uca arcuata (De Haan, 1833). All young crabs below a carapace width of 3.0 mm possessed two small, equal chelipeds. Some crabs with only one cheliped and others with two large chelipeds appeared in the size range of 3.1 to 5.6 mm. The presence of two large chelipeds is transitional; one of these chelipeds is later lost. Cheliped asymmetry of males is attained by losing of one of chelipeds that regenerates into a small cheliped, and the concurrent, continuous growth of the other cheliped.

Une proportion égale de droitiers et de gauchers a été confirmée chez Uca arcuata (De Haan, 1833). Tous les crabes juvéniles ayant une largeur de carapace inférieure à 3,0 mm possédaient deux petits chélipèdes de même taille. Quelques crabes avec un seul chélipède et d'autres avec deux grands chélipèdes sont apparus dans la classe de taille de 3,1 à 5,6 mm. La présence de deux grands chélipèdes est temporaire; l'un de ces chélipèdes est perdu un peu plus tard. L'asymétrie des chélipèdes chez les mâles survient par perte de l'un des chélipèdes, qui est régénéré en un petit chélipéde, tandis que l'autre chélipède continue sa croissance.

Affiliations: 1: Aitsu Marine Biological Station, Matsushima-cho, Amakusa-gun, Kumamoto 861-6102, Japan


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