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University of Minnesota Extension

Species guide - species detail

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Ephialtes spatulata (Ichneumonid parasitic wasp)



Ephialtes spatulata is in the family Ichneumonidae. Ichneumonidae are parasitic wasps that use their long ovipositors to deposit eggs on, into, or near an insect host. It is a large family, with over 3300 described species in North America.


Ichneumonids are typically slender wasps with long ovipositors, sometimes up to twice as long as their body. They have long antennae with 16 or more antennal segments. Ephialtes spatulata are medium-sized Ichneumonids. Females have a very long ovipositor with a drilling tip that they insert through wood into the nest of their insect host.

Nest Structure

Most Ichneumonids are solitary parasitoids whose larvae feed and develop on a single host, although some species' larvae are mobile and will feed on more than one host. Hosts include a wide range of insects in the orders Hymenoptera, Lepidoptera, Diptera, Coleoptera, Neuroptera, and Mecoptera, and spiders and spider egg sacs. In Bee Atlas blocks, Ephialtes spatulata parasitized a wide range of bees and wasps, including Osmia lignaria, Megachile campanulae, Megachile relativa, Heriades carinata, sphecid wasps, and the Eumenid wasp, Symmorphus canadensis.

Hole Sizes

No information at this time.


No information at this time.

Activity Period

No information at this time.


Triplehorn, C.A and N.F. Johnson. 2005. Borror and DeLong's introduction to the study of insects, 7th ed. Thomson, Brooks/Cole, Australia. Thank you to John Luhman for identifying all of our Ichneumonid specimens.

Minnesota Record Map

These data are from the Minnesota Bee Atlas project.

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