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Cocoon - Antheraea polyphemus

Cocoon - Antheraea polyphemus
Stillwater, North central Oklahoma County, Oklahoma, USA
December 31, 1969
Size: About 1.25" by 3/4"
This perfect cocoon--and another like it--was found in our yard/woods years ago. I broke the twig it is on and taped it as you can see in the image. It has been displayed in a glass-fronted cupboard for years. We are about to move but before discarding it, I am curious to know what insect may have emerged from it? Can you help me id the culpret?

Moved from ID Request.

The cocoon you have probably belonged to a Giant Silkmoth (Saturniidae); Most likely a Polyphemus or Luna moth, but I don't know all of the Giant Silkmoths of Oklahoma.

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