leaf bettle

Please, update, thanks!

Chrysomelidae, Cassidinae, Mesomphaliini, Chelymorpha alternans. https://www.flickr.com/photos/pasha_k/9621011749/

Muy interesante!

It's a species of Chelymorpha. They are often extremely variable in their pattern (even more than coccinellids). So it's probably not a case of sexual dimorphism, rather polymorphism. See pictures here: http://www.biol.uni.wroc.pl/cassidae/katalog%20internetowy/chelymorphacribraria.htm

I am not familiar with dimorphism in chrysomelidae. I have seen images of loose couplings between different species but do not think they get too serious. Either way, it is an excellent spotting.