Moved from Physonotini.

Wow what a sweet beauty. I love tortoise beetles. I hope to see that kind someday. Beautiful. Thank you for sharing.

I'd like to suggest that this might be Eurypepla calochroma. The elytra and pronotum shape, black suctellum, and the median black pronotal spot (diamond?) appear to match Eurypepla calochroma well. The location also is just within the stated range extent. The punctation quantity and density also appears to match. Although the metalic lime elytra ground color is the same as E. calochroma, the large areas of metalic blue are not mentioned on any of the descriptions I've found. Nevertheless, (prior to BugGuide) most of the specimens studied are actually long-dead, which results in all these metalic colors disappearing and the poor tortoise beetles fading to a dull orange-brown. That said, here's the other Eurypepla calochroma currently in the Guide

I should have also stated that I don't believe this is a Golden Tortoise - the punctation is far greater, and only the terminal segment of the antenna is dark.

Now I'm feeling a bit out on a lim with this one, as it clearly doesn't exactly match either the one BugGuide photo, nor the text descriptions. Hopefully an expert (which I am not) will either confirm this ID or set me stright.

If you still have the individual, please save it for a while longer. If this turns out to be an introduced species, actually having the specimen might be important. Also, if you could get a top-down dorsal photo, that might help with the ID (glad you took the underside shot - so important for many beetle IDs. I could even begin to make out the tarsal claws, which are used in some tortoise genus determinations.).

Thanks for sharing these photos of this beautiful creature!

The color seems to be under a transparent shell. Hope you get an answer, and thanks for posting.

but that's beautiful! I did read that golden tortoise beetles will change color when captured... maybe that's the case?