Ataenius castaniellus is a species of beetle of the family Scarabaeidae. It is found in El Salvador, Guatemala, Honduras and Mexico (Hidalgo, Oaxaca, Puebla, Tamaulipas, Veracruz).
Description Adults reach a length of about . They have an elongate oblong, moderately convex, dark castaneous and shining body.
Life history Specimens have been collected in dry cattle excrements.
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