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Insectes Sociaux

, Volume 27, Issue 4, pp 399–414 | Cite as

Variations biometriques des corps allates pendant la differenciation des castes reine et ouvriere chezplagiolepis pygmaea Latr. (Hymenoptera: Formicidae)

  • J. P. Suzzoni
  • A. Grimal
Article

Resume

Le volume et le nombre de cellules des corps allates ont été suivis pendant le développement larvaire et nymphal. Le nombre de cellules est, à quelques unités près, déterminé dès le premier stade larvaire. La croissance des corps allates pendant la période indifférenciée est due à une augmentation du volume cellulaire.

Pendant la différenciation chez les larves-reines, le volume des corps allates augmente beaucoup tandis que chez les larves-ouvrières il reste pratiquement constant. Dans les deux cas, il décroît peu de temps avant la prénymphose et jusqu'à la mue imaginale. De faibles variations du nombre des cellules ont été observées chez les deux types de larves. Les modifications constatées au cours du développement sont donc essentiellement le fait d'une croissance des cellules différenciée selon la caste. Malgré une grande variabilité individuelle, il existe pendant le développement larvaire, und grande symétrie entre les corps allates droit et gauche aussi bien pour le volume que le nombre de cellules.

Biometric changes in the corpora allata during queen and worker caste determination in plagiolepis pygmaea Latr. (Hymenoptera: Formicidae)

Summary

The volume and the cell number of the corpora allata have been studied during the larval and pupal stages. The cell number is, within a few units, determined from the first larval instar. During the undifferentiated period corpora allata growth is due to increase in cell volume.

During differentiation of the queen-larvae, the corpora allata volume increases a great deal, whereas it stays roughly, the same in worker-larvae. In both cases, it decreases shortly before the pharate pupal stage and up to imaginal moulting. Small variations of the cell number have been noted in the two types of larvae. The differences observed during development are therefore essentially due to cell growth differentiated according to caste. In spite of high individual variability, there is during the larval stage, a good symmetry between right and left corpora allata as regards volume and cell number.

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Copyright information

© Masson 1980

Authors and Affiliations

  • J. P. Suzzoni
    • 1
  • A. Grimal
    • 1
  1. 1.Laboratoire de Biologie des InsectesUniversité Paul-SabatierToulouse CedexFrance

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