Canthon smaragdulus is a species of beetle of the family Scarabaeidae. It is found in Argentina, Paraguay, French Guiana and Brazil (Ceará, Pernambuco, Bahia, Alagoas, Minas Gerais, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Mato Grosso do Sul).
Description Adults reach a length of about . The dorsal and ventral surface are green to blue, always with a blue metallic sheen.
Subspecies Canthon smaragdulus smaragdulus (Argentina, Paraguay, Brazil: Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Mato Grosso do Sul) Canthon smaragdulus subviridis Schmidt, 1922 (French Guiana, Brazil: Ceará, Pernambuco, Bahia, Alagoas, Minas Gerais, Espírito Santo, Rio de Janeiro, São Paulo)
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