Martinsellus signatus is a species of beetle in the family Cerambycidae, the only species in the genus Martinsellus.Bezark, Larry G. A Photographic Catalog of the Cerambycidae of the World . Retrieved on 22 May 2012. It is found in Brazil (Goiás, Mato Grosso do Sul, Bahia, Minas Gerais, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul), Bolivia (Santa Cruz), Paraguay, Argentina (Misiones, Corrientes, Buenos Aires) and Uruguay.
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