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Quarterly Journal of Microscopical Science, Vol s3-103, 253-259, Copyright © 1962 by Company of Biologists

The Egg of Tetrix (Tetrigidae, Orthoptera), with a Discussion on the Probable Significance of the Anterior Horn

J. C. HARTLEY 1

1 Department of Zoology, University of Bristol

The structure of the egg-wall of Tetrix vittata and the changes that occur in it during development are described. The chorion has a hollow layer held open by struts and freely permeable to both air and water. At the posterior end the struts become finer and the chorion then resembles that of the Acrididae. A thick serosal cuticle develops with a hydropyle at the posterior end. This cuticle is dissolved before hatching. The egg takes up water and increases its volume during development. There is a long horn with a hollow core at the anterior end of the egg. This horn is entirely chorionic and appears to provide the egg with an expansion chamber.






© The Company of Biologists Ltd 1962