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An Extra Claw On the First and On the Third Cheliped of the Crayfish, Procambarus Clarkii (Decapoda, Cambaridae)

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Two live crayfish, one with an extra claw on a first, and another with an extra claw on a third cheliped, were obtained. Each extra claw developed from the base of a primary propodus with mirror-image symmetry. Both extra dactyls were movable. However, the extra claw on the first cheliped was usually in a closed position, while that on the third was in the opened position. The crayfish did not voluntarily swing the extra dactyl. There were muscles and nerves in the extra claws, but they might not have been complete for a claw. Some of the nerve fibers were supplied to the extra claw from the primary nerve bundles. The extra claw might have been formed as the complementary image of the primary claw.

Affiliations: 1: ) Department of Biology, Faculty of Science, Yamagata University, Yamagata 990, Japan; 2: ) Department of Biology, Faculty of Science, Okayama University, Okayama 700, Japan

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