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Quarterly Journal of Microscopical Science, Vol s3-105, 415-422, Copyright © 1964 by Company of Biologists

Spittle-production and Tube-Building by Cercopoid Nymphs (Homoptera)

2. The Cytology and Function of the Granule Zone of the Malpighian tubules of Tube-Building Nymphs

A. T. MARSHALL 1

1 Division of Entomology, C.S.I.R.O., Canberra, Australia, and the Department of Zoology, University of Hong Kong

The proximal segment of the nymphal Malpighian tubules of tube-building cercopoids consists of two secretory zones, an anterior fibril zone and a posterior granule zone. Cytological changes in the latter are correlated with the production of spittle before each ecdysis. Granules are present in the cells during inter-ecdysal periods. Shortly before spittle-production and ecdysis, coalescence of the granules occurs, followed by cytoplasmic vacuolation and the subsequent liberation of coalesced material into the tubule lumen.

The granule zone is essentially similar to the whole of the proximal segment of the Malpighian tubules of spittle-bug nymphs, although much smaller in length and cross-section. This is consistent with the reduced spittle-producing requirements of tube-building nymphs.






© The Company of Biologists Ltd 1964