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Journal of Experimental Biology 40,247-256 (1963)
Published by Company of Biologists 1963

Excretion in the Blood-Sucking Bug, Rhodnius Prolixus Stål : I. The Control of Diuresis

S. H. P. MADDRELL ¹

¹ Department of Zoology, University of Cambridge; Department of Biology, Dalhousie University, Halifax, Nova Scotia, Canada

1. The mechanism underlying diuresis in Rhodnius has been investigated.

2. An isolated preparation of the Malpighian tubules of a 5th-instar larva is described.

3. The rate of secretion by such a preparation, isolated in a drop of haemolymph, is at first high but soon falls to a low level. It can be restored by the addition of haemolymph taken from an insect during diuresis.

4. It has been shown that diuresis is promoted by some substance, presumably a neurohormone, which can be extracted from the posterior neurosecretory cells of the fused ganglionic mass situated in the mesothorax.

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