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Monday Night Mystery

March 8, 2010 by myrmecos

Alright, Sherlock.  What’s going on here?

Five points each for the identity of the big round thing, for the insect at the top, and for the insect at the side. Ten points for describing the story.

And a freebie point to anyone who comes up with an idea for what to do with all these points.

This scene was photographed in the fall in southern Illinois. Here are close-ups of the critters:

mystery wasp #1

mystery wasp#2

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Posted in illinois, Nature | Tagged entomology, Insects, mystery, Photography | 12 Comments

12 Responses

  1. on March 8, 2010 at 5:45 pm BAHarpur

    I am pretty sure it is a Cypinidae and this is an excellent short of emerging young (Kinsey would be proud). It isn’t the Oak-apple gall wasp is it? If it is then that round thing is the gall resulting from egg-deposition from an adult.


  2. on March 8, 2010 at 7:33 pm tuckerlancaster

    Wasp number one looks like a live oak gall wasp

    the round thing looks like an oak gall

    This is how I think the story goes]
    The gall was originally formed when a wasp, such as a live oak gall wasp, deposited its eggs under the bark of the tree, triggering the formation of the gall. Those eggs then hatched into a larvae which developed in the gall and fed on the tree. However, this well stocked fortress is a perfect target for other parasitic wasps, such as one or possibly both of those wasps pictured, which would proceed to inject their eggs into the gall, where they would hatch and eat the previous inhabitant. A sort of parasitization of parasites if you will.


  3. on March 8, 2010 at 9:25 pm ihateaphids

    GALL WASP!!!???


  4. on March 8, 2010 at 10:44 pm Dave

    Even a herpetologist says it’s a gall wasp on a gall.

    Or some sort of turtle…


  5. on March 9, 2010 at 12:43 am Ted C. MacRae

    Geez, I can never beat the stampede!

    Yes, the object is a gall caused by a cynipid gall wasp. Live oak doesn’t occur in Illinois, but it is definitely oak of some kind (perhaps pin). One of those wasps is the cynipid gall maker itself emerging from the gall, while the other I presume is a parasitoid of the cynipid – but I don’t know which is which (so I guess no points for me there).

    To redeem points, Alex will mention your blog daily for a week.


  6. on March 9, 2010 at 6:52 am TGIQ

    I’m going to go out on a limb (ha!) and say it’s an round bullet gall, not apple…the apple galls (Amphibolips spp.) generally form on leaves, and this one looks like it’s on the twig-Disholcaspis quercusglobulus?

    The other is an inquiline…it may not actually directly parasitize the original occupant of the gall…the larva could either feed on the gall tissue or it could smother the original occupant of the gall.


  7. on March 9, 2010 at 8:21 am James C. Trager

    I don’t know the correct names for many galls, but I agree this one looks like a gall on a twig, apparently on Quercus bicolor.

    I look forward to learning the truth about the wasplets…


  8. on March 9, 2010 at 9:58 am gmramon

    A gall, a gall wasp and it´s hyperparasitoid.


  9. on March 9, 2010 at 10:12 am myrmecos

    Here’s a hint: Both wasps are ovipositing.


  10. on March 9, 2010 at 10:23 am James C. Trager

    Both chalcidoids of some sort, then?


  11. on March 9, 2010 at 11:37 am aariq

    Oh, well if they’re both ovipositing, then they’re both parasitic/inquillinous on whatever that gall is. They both look like cynipids to me.


  12. on March 9, 2010 at 3:37 pm TGIQ

    Ok, then, new story:

    1. Wasp A (not in the picture) is a gall-maker; its larva lies
    within the gall
    2. Wasp B (one of those two up there) is an inquiline; it oviposits in the gall
    3. Wasp C (the other one of those two up there) is a parasitoid; it oviposits in the eggs/larvae of the inquillinous wasp

    As for IDs, fuhgeddaboudit.



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