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Photo#226060
Unknown Caterpillar  - Anisota senatoria

Unknown Caterpillar - Anisota senatoria
Shannon County, Missouri, USA
September 17, 2008
Size: ~ 1 1/2 inches
Put it on a random Black Maple leaf left sitting on table and it began to eat.

It certainly looks like...
...something in the Anisota senatoria complex, but I can't explain why it would be eating maple.

 
I agree that this is Anisota
I agree that this is Anisota senatoria. It is probably eating the maple because it is in it's final instar and usually (from my experience) larvae tend to be quite greedy, eating many different foodplants than what they usually eat. It is not a color form of the rosy maple moth.

Rosy Maple Moth?
Perhaps a color variant of the Rosy Maple Moth. Related to Anisota and that would explain its eating habits.

Strange that it ate maple leaves
because it looks like genus Anisota, in which case oak would be its preferred hostplant.

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