Coxal vesicles

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Coxal vesicles or ventral vesicles are vesicle-shaped formations on the basal limbs ( coxes ) of the extremities of pygmy pods (symphyla) or on the remnants of extremities ( coxites ) in basal groups of hexipedes such as the double tails (diplura). In the Stummelfüßern (onychopoda) homologous bubbles in the form exist Crural- or leg glands .

function

They can be everted using hemolymph pressure and can be pulled in again by their own muscles . The purpose of the coxal vesicles is only partially understood. They have a transport epithelium on the vesicle wall , so it is assumed that they serve for osmoregulation by absorbing ions ( sodium and chloride ions ) and water. In rock jumpers (Archaeognatha) and springtails (Collembola), they also have adhesive glands with which the animals can attach themselves to the substrate.

In springtails, the coxal vesicles are homologous to the ventral tubule .

supporting documents

  • Coxal vesicles. In: Herder-Lexikon der Biologie. Spektrum Akademischer Verlag, Heidelberg 2003, ISBN 3-8274-0354-5 .