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Syrphid Buffet

Syrphid Buffet
Dog Canyon, Otero County, New Mexico, USA
June 15, 2011
on milkweed

Images of this individual: tag all
Syrphid Buffet Syrphid Buffet

Very odd looking larva. Do you have other pictures?

Not different angles...
but I uploaded a picture from six days later. Could the first one be pre-pupal? I don't know if these larvae undergo color changes as in lepidoptera

It doesn't look like any aphid eater syrphid I ever saw. It doesn't look like Aphidoletes larvae either.
I am amazed that it hasn't moved in six days. The size doesn't seem to have changed much, comparing it to that of the surrounding aphids.
My syrphid larvae kept wandering about and they grew rapidly. I have no idea what this is. Perhaps it should be moved to ID request.
The color change could be due to its being freshly molted and then gradually getting darker.

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