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

Upcoming Events

National Moth Week photos of insects and people. Here's how to add your images.

Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, insects and people from the 2018 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

Tiny wasp from white oak leaf - Baryscapus - female

Tiny wasp from white oak leaf - Baryscapus - Female
Westborough Wildlife Management Area, Westborough, Worcester County, Massachusetts, USA
April 29, 2010
Size: ~1 mm
In March, I collected a white oak leaf from the forest floor and placed it in a Ziploc bag. It has one of these galls:

and several of these:

Yesterday (4/28/10), I looked in the bag and found two of the tiny wasps pictured above, as well as this one, which clearly emerged from the larger gall:

The timing of their emergence makes me wonder if these smaller wasps could be inquilines from the larger gall, but they could have fit inside the smaller galls, so perhaps they emerged from those and happened to do so at the same time as the larger wasp. However, I've looked and haven't found any exit holes in the smaller galls.

Moved from Tetrastichinae.
Det. Michael W. Gates; "Group needs revision; adults not identifiable to species."

Moved from Eulophidae.
Christer Hansson: "Tetrastichinae, a female"

Moved from Ants, Bees, Wasps and Sawflies. Thanks for all your help with these little wasps.

Wing venation, short antennae with only 4 funicle segments, 4-segmented tarsi, and subtriangular prepectus point to this family. The clubbed antennae indicates a female (males with clubs are very rare). Since we are at the end of the size spectrum with regard to this family (1mm), it is quite possible that this is a hyperparasitoid that attacked another primary parasitoid within the gall. Difficult to know for sure because this is a highly specialized group that contains many different primary and hyperparasitoid species.

See reference here.

Comment viewing options
Select your preferred way to display the comments and click 'Save settings' to activate your changes.