Experimental induction of claw transformation in snapping shrimps

Abstract

Abstract The effectiveness of various manipulations of the major claw in inducing the contralateral minor claw to transform into a major claw in adult snapping shrimps, Alpheus heterochelis , was studied. While removal of the major claw was 100% effective in inducing transformation, sectioning of its nerve was effective in about two‐thirds of the animals, and tenotomy of its closer muscle was effective in less than one‐half. Occasionally, tenotomy of the opener muscle induced transformation, whereas immobilizing the claw was totally ineffective. This gradation in effectiveness, which is related to the degree of trauma applied to the major claw, suggests a central mechanism regulating bilateral asymmetry of the claws.