Sunday, March 31, 2019

New-born thimbleberry wasps

A month ago, I collected a few thimbleberry galls, brought them home, and split one apart to look at the larvae hidden inside. (Story, here.) I stashed them afterwards in a plastic container and set them aside in a cool spot.

This week, I opened the container. And several tiny wasps have burrowed their way out.

The larvae as they were a month ago.

Another one of the galls, this week, with exit holes.


And one of the newly-emerged wasps, Diastrophus kincaidii. About 2.5 mm long.

Another one, bent over, showing off her wings.

Wasp # 3. Wasps have that tiny waist; it seems strange that it can support the weight of the heavy abdomen.

I just checked again. There were three galls, all on the small side. And now there are a dozen new wasps, freshly emerged. I left the lid off; I don't know where they'll go, since I have no thimbleberry canes nearby. Maybe they'll find an alternate host in the raspberries.

3 comments:

  1. Great stuff. I love raising things to aduthood; the development process can be facinating to document. I currently have a large beetle larva that seems in no hurry to pupate.

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    Replies
    1. I've got a couple of larvae, unidentified, too. They're stashed outside in a corner about the same micro-climate as where I found them. The days are warming up now, so I've brought them inside to my cool corner.

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  2. We have thimbleberries all over the logging roads here. My mason bees are starting to emerge. I saw one yesterday resting outside of his hole before he flew off. My hotels are all ready to go for the females to emerge. - Margy

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