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 of 2018 gathering

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

TaxonomyBrowseInfoImagesLinksBooksData
Photo#329156
Unicorn Caterpillar Moth - Schizura unicornis

Unicorn Caterpillar Moth - Schizura unicornis
Camden County, New Jersey, USA
September 3, 2009
Size: ~1cm
Found a day after this caterpillar:



So, is this a "normal" pupa or is it the victim of a fungal infection?

Images of this individual: tag all
Unicorn Caterpillar Moth - Schizura unicornis Unicorn Caterpillar Moth - Schizura unicornis Unicorn Caterpillar Moth - Schizura unicornis

....
ignore this post :-)

Moved

i raised a couple of these..t
i raised a couple of these..there is something wrong there..they have a brown pupae, and pupate on the ground... thats a bad thing that happened there. the experts can tell you what.

 
Interesting
So you think this is a victim of fungal infection?

 
Maybe
The only caterpillar-attacking fungi I'm aware of cause their victims to shrivel up rather than to bloat like this. It reminds me of a victim of an Aleiodes mummy wasp, but there is not one that is known to attack this particular species. I might guess A. cameronii, since that species is something of a generalist with recorded hosts including one unidentified notodontid (see Shaw 2006, reference on the Aleiodes guide page). It would be interesting to see a close-up of the white area under the caterpillar and try to determine whether that looks like silk (spun by wasp larvae) or fungal mycelium. I've never seen an Aleiodes-killed mummy with silk under it, though, come to think of it. I guess it could be a variation on this:

?
Short answer is, I dunno! But it's an interesting puzzle.

 
Okay
I've added 2 larger photos that show the white area better. I almost looks like a ball of white fuzz covered by a thin layer of the caterpillars skin.

 
Yeah, that's what it looks like all right...
Weird. My gut feeling is that it's a cocoon mass of some kind of braconid, but it doesn't look quite like anything I've ever seen or heard of. I'll try to get some expert opinions... stay tuned...

 
Campopleginae, most likely
Here is the response I got from Scott Shaw, a braconid specialist who wrote the Aleiodes reference I cited above:

"This caterpillar has been parasitized by a campolegine ichneumonid (Ichneumonidae: Campopleginae). Most likely it is supported by one elongate-oval silk cocoon. David Wahl at AEI in Gainesville Florida is an expert on these, maybe you can get his opinion on the genus and species."

I should have thought of this, since braconids typically leave much more of the caterpillar intact, while campoplegine ichneumonids tend to leave little more than the skin and head capsule. Part of why that didn't occur to me is that I didn't see your size estimate, and was picturing this being a full-sized caterpillar. Anyway, here's David Wahl's response:

"Yes, it is most likely a campoplegine, but what it might be is another question: there are several candidate genera but going from just a picture isn't a good move."

 
Thanks...
for all the information. I wish I had saved this specimen to see what emerged. At the time of the photograph, I incorrectly assumed this was a typical Unicorn Caterpillar Moth pupa as I had never seen one before.

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