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My husband also had an encounter with this iridescent turtle beetle. And finally I have found its ID. It is the Geiger Tree tortoise beetle! As described in the reference, formerly Physonota calochroma floridensis. Size: 8-11 mm. Live adults are brilliant lime green with a black spot in the middle of the pronotum. In this book is mentioned that adults change colors, from wine-purple, green, to red-bronze or gold. In fact, these colours are constantly changing in the same specimen but when mating the colour remains light green. http://www.springer.com/gp/book/97807923...
Seen in Bonaire. The species range is described as in Florida: from Palm Beach to Key West. However is widespread to the Caribbean, as long as they find their food source, the Geiger Tree (Cordia sebestena)
First placed in the genus Eurypepla by Blake in 1966; listed under that genus by Borowiec in his World Catalog of Cassidinae in 1999.