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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  and
M. Benoit
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.
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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 (L2−4) 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
Information
Bulletin of Entomological Research , Volume 67 , Issue 1 , March 1977 , pp. 129 - 141
Copyright
Copyright © Cambridge University Press 1977

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