Agriotypinae

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Agriotypinae
Agriotypusarmatus.jpg
Agriotypus armatus from British Entomology
Scientific classification
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Agriotypinae

Haliday,1838
Genus

Agriotypus

Agriotypinae is a subfamily of ichneumonid parasitoid wasps found in the Palaearctic region. This subfamily contains only one genus, Agriotypus . The known species are aquatic idiobiont ectoparasitoids of Trichoptera pupae.

Contents

There has been disagreement over the taxonomic placement of Agriotypus. It has variously been placed in Proctotrupoidea and considered a separate family of Ichneumonoidea.

Life cycle

The development of Agriotypus armatus has been documented on the host Silo pallipes in a stream in South-West England. [1] The life cycle of the wasps took one year, with adults present in May and June. Eggs were laid in the pupae or prepupae of the host. The larvae underwent 5 larval stages before overwintering as adults in their pupal case. Larval instars 1-4 fed externally on the host, while instar 5 rapidly consumed the entire host body. Before pupating, the larvae built a separate pupal case from silk within the trichopteran pupal case. The wasp pupal case included a 1.5 cm silk ribbon which extended into the water, probably to act as a plastron. Adults emerged in the spring, after the water temperature had reached 10 degrees C.

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References

  1. Elliott, J. M. (1982). "The Life Cycle and Spatial Distribution of the Aquatic Parasitoid Agriotypus armatus (Hymenoptera: Agriotypidae) and its Caddis Host Silo pallipes (Trichoptera: Goeridae)". Journal of Animal Ecology. 51 (3): 923–941. doi:10.2307/4014. JSTOR   4014.