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Family Ichneumonidae - Ichneumonid Wasps

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Ichneumonids of North America
From the "About" page:

"Ichneumonids of North America is an online resource for ichneumonid biodiversity. Ichneumonids are a fascinating group of parasitoid wasps with over 25,000 described species and likely over 100,000 total species. In North America (north of Mexico), there are around 5,508 described species and probably several thousand undescribed species. Like many hyper-diverse groups, identification resources and other information about ichneumonids are severely lacking in relation to their diversity. Even identifying ichneumonids to a particular subfamily can be challenging, let alone to genus or species.

Broad G. (2011) Identification key to the subfamilies of Ichneumonidae (Hymenoptera)
A helpful illustrated key designed with the fauna of British Isles in mind but giving good idea of the features used to separate ichneumonoid families and most of the ichneumonid subfamilies in our area, too

Carlson R.W. () Ichneumonidae catalog
A catalog of the ichneumon wasps north of Mexico (taxonomy, hosts, distribution, references); part of the Database of Hymenoptera in America north of Mexico

Classification and Systematics of the Ichneumonidae
David Wahl's catalog of generic and higher names within Ichneumonidae is updated based on new publications and is the classification used by BugGuide. Names from Townes' revisions should be checked against this list for current status.

2022 edit: Replaced dead link

Review of North American species of the genus Lymeon Foerster, 1869 (Hymenoptera: Ichneumonidae: Cryptinae)
By Kasparyan, D. R., & Ruíz, C. E
Zoosystematica Rossica, 13(1), 53-79, 2005

Includes our 4 species along with 29 additional neotropical species.

Hosted on the Zoological Institute of the Russian Academy of Sciences website:

The Ecology of Commanster: Therion circumflexum (Linnaeus 1758) (Family Ichneumonidae)
Web archive of observational data of Therion circumflexum in Commanster, Luxembourg. Some caution may be warranted regarding applying data to our area due to differences in climate. Giant Ichneumon (Megarhyssa macrurus) Ovipositing
A really nice description of how Megarhysssa oviposition works. With video.

Key to Giant Ichneumonid Wasps (Megarhyssa) of USA/Canada
By Zachary Dankowicz & Juan Cepeda Espinosa

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