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Morphology and biometry of larval instars of Pimpla instigator (F.) (Hymen-optera: Ichneumonidae)

Published online by Cambridge University Press:  10 July 2009

D. Rojas-Rousse
Affiliation:
Laboratoire d'Ecologie Expérimentale, Université François Rabelais, Avenue Monge, 37200 Tours, France.
M. Benoit
Affiliation:
Laboratoire d'Ecologie Expérimentale, Université François Rabelais, Avenue Monge, 37200 Tours, France.

Abstract

Larvae of Pimpla instigator (F.) were found to pass through five larval instars during development. Initial studies of external morphology identified only three morphological groups: the primary larva (L1) the intermediate larvae (L24) and the final instar larvae (L5). Biometrical study of the maximum head width, width of buccal mask, inter-metatentorial distance and diameter of spiracles permitted morphological separation of all five larval instars. Under a 16 h photophase (at 25±1°C; 70±10% r.h.) and an 8 h scotophase (at 15±l°C; 80±10% r.h.) the 2nd, 3rd and 4th larval instars were found to last about 24 h each, and the 5th instar 9±1 days. Progressive development of the genital buds during the 5th instar and prepupal stages facilitated sexing of the larvae.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1977

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