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VIII.—Humoral Control of Metamorphosis and Diapause in the Larvæ of Certain Calliphoridæ (Diptera: Cyclorrhapha).*

Published online by Cambridge University Press:  11 June 2012

Alastair Fraser
Alastair Fraser
Affiliation:
Department of Zoology, University of Glasgow.
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Synopsis

The humoral mechanism controlling metamorphosis in larvæ of Calliphora vomitoria L. and Lucilia cæsar L. and controlling diapause in the latter has been investigated by experiments involving extirpation and implantation of certain organs and section of nerves to the corpus cardiacum. It is confirmed that the large lateral cells of Weismann's ring, the thoracic gland cells, produce a hormone which promotes the several processes covered by the term “pupation”, including the development of anlagen before puparium formation, puparium formation, the third larval moult and the last larval moult. The stimulus to thoracic gland activity is provided by the brain and is transmitted via the nerves from that organ to the corpus cardiacum. This stimulus is apparently humoral and is liberated from the corpus cardiacum into the blood.

The thoracic glands of L. cæsar larvæ are inactive during diapause. Implants of active C. vomitoria glands into L. cæsar diapause larvæ terminate diapause in the latter. The immediate cause of the arrest in development is the failure of the brain to activate the thoracic glands.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 67 , Issue 2 , 1959 , pp. 127 - 140
Copyright
Copyright © Royal Society of Edinburgh 1959

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Footnotes

*

This paper was assisted in publication by a grant from the Carnegie Trust for the Universities of Scotland.

References

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