Ateralphus subsellatus is a species of beetle in the family Cerambycidae. It was described by White in 1855.Bezark, Larry G. A Photographic Catalog of the Cerambycidae of the World . Retrieved on 22 May 2012. It is found in Brazil (Pernambuco, Paraíba, Bahia, Minas Gerais, Espírito Santo, Rio de Janeiro, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul), Bolivia (Santa Cruz), Paraguay (San Pedro, Central, Alto Paraná) and Argentina (Catamarca, Salta, Tucumán, Misiones).

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