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The Growth-Changes and Structure of the Egg of the African Migratory Locust, Locusta migratoria migratorioides, R. & F. (Orthoptera, Acrididae)

Published online by Cambridge University Press:  10 July 2009

Mithan Lal Roonwal
Mithan Lal Roonwal
Affiliation:
(From the Entomology Department, Zoological Laboratory, Cambridge.)
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Extract

The eggs of Locusta migratoria migratorioides, R. & F., increase in size during development. The increase is due to the absorption of water from the surrounding moist soil.

The wet weight of a freshly laid egg is 0·0063±0·0008 gms, and of a fully developed egg 0·014±0·002 gms. The dry weight of a freshly laid egg is 0·003± 0·0004 gms. and of a fully developed egg 0·0024±0·0002 gms. The water-content of an egg increases from 51·92±3·53 per cent, of the wet weight in the freshly laid egg to 82·36±2·14 per cent, in the fully developed egg.

The egg-wall consists of an exo- and endochorion and a thick vitelline membrane. The latter has a felt-like structure in the freshly laid egg, but as the egg develops, this membrane increases in thickness and acquires a laminated character.

The micropylar apparatus consists of a ring of about 35–43 oblique, funnelshaped canals arranged round the egg near its posterior end.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 27 , Issue 1 , February 1936 , pp. 1 - 14
Copyright
Copyright © Cambridge University Press 1936

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