Ataenius clavatus is a species of beetle of the family Scarabaeidae. It is found in Argentina and Brazil (Mato Grosso, Mato Grosso do Sul, Minas Gerais, São Paulo).
Description Adults reach a length of about . They have an elongate oblong, convex, moderately shiny, dark brown to piceous body, with the ventral surface and legs reddish-brown.
Life history Specimens have been collected in riverine forests.
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