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Brassolis sophorae
A butterfly in late metamorphosis: half worm half butterfly
Brazilian savanna
Nymphalidae, Brassolinae, Brassolis sophorae.
https://farm3.staticflickr.com/2136/3285...
http://www.scielo.br/img/revistas/ne/v36...
http://www.faunaparaguay.com/ENCARNACION...
http://www.biofaces.com/post/9888/borbol...
http://butterfliesofamerica.com/L/ih/bra...
http://butterfliesofamerica.com/L/ih/sop...
I'm guessing butterfly just judging by the antennae, but I couldn't pinpoint which.
This moth is probably recently hatched from its pupa. Its wings need to extend to their full size before it can fly, which will happen soon (it has probably already happened by the time I post this comment).
Moths are not changing from "worm" to adult!!! The stages are egg, caterpillar, pupa/cocoon, adult...