Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Calendar
Upcoming Events

Discussion, insects and people from the 2018 BugGuide Gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

TaxonomyBrowse
Info
ImagesLinksBooksData

Subfamily Rhyssinae

Giant Ichneumon - Megarhyssa atrata large wasp on window - female Rhyssa Lineolata-- found insect - Megarhyssa nortoni - female What is this - Megarhyssa atrata Male Megarhyssa greenei? - Megarhyssa greenei - male Interesting insect identification needed. - Megarhyssa atrata Giant Ichneumon - Megarhyssa atrata - male - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" (parasitic Apocrita))
Superfamily Ichneumonoidea (Braconids and Ichneumons)
Family Ichneumonidae (Ichneumon Wasps)
Subfamily Rhyssinae
Numbers
234 described species in 8 genera worldwide (4 Oriental); 14 spp. in 4 genera north of Mexico(1)(2)(3)
Size
Ovipositors may exceed 200 mm(3)
Identification
Large size, very long ovipositor, cylindrical abdomen becoming dorsolaterally compressed apically, hind coxae length more than twice their width.
Range
Worldwide except Australian(1); in the New World, the highest diversity occurs in the ne. hardwood forests, whilst in tropical countries there are only 2 genera(3)
Food
Idiobiont ectoparasitoids of the immature wood-boring endopterygote insects, in our area usually larval woodwasps (Siricidae and Xiphydriidae), but may also develop as facultative hyperparasitoids using other woodwasp parasitoids as hosts or on virtually any endopterygote (some have even been cultured in the laboratory on entirely unnatural surrogate hosts)(3)