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The plot thickens 5/29/08 - Syrphus

The plot thickens 5/29/08 - Syrphus
Churchville Nature Center, Bucks County, Pennsylvania, USA
May 29, 2008
Size: 7-8 mm.
Instead of a Syrphid fly, a wasp emerged from this cocoon or puparium.

Related images here.

Update: According to this article, Natural enemies and insecticides that are detrimental to beneficial Syrphidae, a parasitized puparium can be identified early on by its dark, brassy or slightly greasy sheen and its different shape. Emergence takes a little longer than for flies from non-parasitized puparia. This is clearly the case with this one.

Moved from Syrphini.
Other pupae, larvae and adults in the same group were identified as Syrphus.

Moved from Syrphid Flies.

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