Shaw, Mark R (2001) Interactions between adults of some species of Netelia Gray (Hymenoptera: Ichneumonidae: Tryphoninae) and their caterpillar hosts (Lepidoptera). Journal of Hymenoptera Research, 10 (1). pp. 101-11. ISSN 1070-9428

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Abstract

Five species from three subgenera of Netelia were observed ovipositing on their hosts
under laboratory conditions. Two species of the subgenus Bessobates oviposited without a separate
insertion of the ovipositor beforehand. One species of the subgenus Netelia and two of the sub-
genus Paropheltes employed a venom causing weak (often incomplete) temporary paralysis, ad-
ministered as a separate action prior to oviposition. The venoms had no long-term adverse effect
on hosts and it appears that these taxa, and perhaps all other groups of ectoparasitic koinobiont
Ichneumonidae, lack the host-regulating venom systems that have been regarded as instrumental
in the evolution of endoparasitism in some koinobiont cyclostome Braconidae. In all species sub-
stantial parasitoid development was delayed until the final instar host had constructed its pu-
pation site, wherein it was overwhelmed as a prepupa. Species of all three subgenera dumped
eggs in the absence of hosts, and (if kept humid) such eggs subsequently split to reveal a living
first instar larva (but not investigated in the subgenus Paropheltes). Species of all three subgenera
indulged in non-destructive concurrent host-feeding, despite being supplied with honey solution
ad libitum, making the necessary wounds on the host's body with their mandibles. Occasionally
non-destructive host-feeding occurred on hosts that were not also being parasitised.

Item Type: Article
Subjects: Q Science > QL Zoology
Theme: Collections & collecting
Department: Natural Sciences
Depositing User: Users 12 not found.
Date Deposited: 16 May 2011 10:03
Last Modified: 16 May 2011 10:03
URI: http://repository.nms.ac.uk/id/eprint/520

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