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Journal of Experimental Biology 66,197-201 (1977)
Published by Company of Biologists 1977

Egg Diapause in Ephippiger Cruciger (Orthoptera: Tettigoniidae) : III. Abnormal Development Through the Final Egg Diapause

R. L. DEAN ¹ and J. C. HARTLEY ²

¹ Department of Zoology, University of Nottingham, England; Department of Zoology, University of Western Ontario, London, Canada.
² Department of Zoology, University of Nottingham, England

Normally the egg of Ephippiger cruciger is subject to diapause when the embryo is almost fully developed. Most eggs die or develop erratically and slowly when chilled for some time at earlier non-diapausing stages. However, after 2 or 3 months' cooling at a stage just before catatrepsis a few eggs developed more rapidly than usual and hatched without intervention of a diapause, at a temperature that is normally too high to allow diapause development to proceed. A possible mechanism, involving the neurosecretory system, for this diapause pattern is suggested.