Itoplectis

Förster, 1869

Species Guides

Itoplectis is a of in the Ichneumonidae, first described by Arnold Förster in 1869. The genus contains approximately 35 to 61 recognized with distribution. Members are solitary parasitoids that attack lepidopteran pupae and have been studied extensively for their potential as agents. Several species, particularly I. conquisitor and I. naranyae, serve as model organisms for research on parasitoid , learning, and chemical .

Itoplectis conquisitor by (c) Zachary Dankowicz, some rights reserved (CC BY), uploaded by Zachary Dankowicz. Used under a CC-BY license.

Itoplectis by (c) Paul Cook, some rights reserved (CC BY), uploaded by Paul Cook. Used under a CC-BY license.

Itoplectis orgyiae by the Smithsonian. Used under a CC0 license.

Pronunciation

How to pronounce Itoplectis: /ˌaɪtoʊˈplɛktɪs/

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Images

Distribution

distribution. Documented occurrence records include Denmark, Norway, Sweden, and the United States (Vermont).

Host Associations

Galleria mellonella - Used for rearing and as natural food source for ; pupa blood serves as natural food regimen
Thymelicus lineola - Rearing ; no preimaginal conditioning observed
Celerio euphorbiae - Source of chemicals inducing oviposition in I. conquisitor
Coptocycla texana - for I. mexicanus (pupa)

Behavior

Females of I. conquisitor exhibit associative learning, capable of linking color cues with presence to improve searching ; this conditioning affects host searching but not attack distribution once hosts are located. The shows an innate preference for blue over yellow. I. conquisitor lacks preimaginal conditioning— show no preference for their natal host regardless of rearing experience. I. naranyae females emit volatile most strongly shortly after , attracting males; older males (30 days) are most responsive, and males with prior female experience respond more strongly than naïve males. Field tests confirm virgin females attract wild males, indicating chemically mediated mate finding operates at close to moderate ranges.

Ecological Role

solitary of lepidopteran pupae. Functions as a agent. Sex ratio in I. naranyae is adaptively controlled in response to size, with host-size dependent sex allocation documented in field .

Human Relevance

Studied as a agent for management of lepidopteran pests. Artificial diets (liquid and candied) have been developed for I. conquisitor that eliminate the need for material while maintaining equivalent to natural food regimens, facilitating mass rearing for biocontrol programs. traps show potential for monitoring and managing I. naranyae . Conditioning to specific host plant cues prior to release may improve establishment success against target pests.

More Details

Taxonomic History

The was first described by Arnold Förster in 1869. Kasparyan recognized approximately 35 , while GBIF includes 61 species. Notable described species include I. conquisitor (Say, 1836), I. maculator (Fabricius, 1775), I. melanocephala (Gravenhorst, 1829), and I. naranyae (Ashmead, 1906).

Oviposition Stimuli

In I. conquisitor, oviposition is induced by chemicals. The active fraction consists of hexoses and approximately 19 common ; hexoses may act as synergists. I. conquisitor oviposits in hemolymph of Lepidoptera, Hymenoptera, Coleoptera, and Trichoptera, but not in Hemiptera, Orthoptera, Neuroptera, Plecoptera, or Crustacea.

Host Shelter Recognition

I. conquisitor can be conditioned to attack tubes of particular lengths or diameters and to distinguish tubes mounted on pins versus plastic forms. However, females cannot distinguish between horizontal and vertical tubes of the same size and cannot be conditioned to prefer horizontal orientations.