Ataenius morator is a species of beetle of the family Scarabaeidae. It is found in Argentina, Bolivia, Brazil (Acre, Amazonas, Bahia, Ceará, Goiás, Maranhão, Mato Grosso, Minas Gerais, Pará, Paraíba, Rio de Janeiro, Rondônia, Roraima, Santa Catarina, São Paulo, Tocantins), Colombia, Ecuador, Guadeloupe, Guyana, Paraguay, Peru, Suriname, Trinidad & Tobago and Venezuela.
Description Adults reach a length of about . They have a strongly alutaceous, piceous or greyish black, glabrous body. They are uncoated, but sometimes dusted.
Life history Specimens have been collected in various habitats including mangrove areas, under vegetation, in bovine dung, and in decomposing bananas.
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