A. ater may refer to: Abacetus ater, a ground beetle found in Australia Achalinus ater, Bourret's odd-scaled snake, found in Vietnam and China Agrilinus ater, a scarab beetle found in the Palearctic Aphodius ater, a synonym of Agrilinus ater Aiteng ater, a sea slug found in Thailand Ampeloglypter ater, a weevil Anguis ater, a synonym of Anilius scytale, a snake found in South America Anthonomus ater, a weevil found in North America Apalone ater, a synonym of the subspecies Apalone spinifera atra, the black spiny softshell, a turtle found in Mexico Arion ater, the black slug, a gastropod native to Europe and invasive to North America and Australia Armadillo ater, a synonym of Armadillidium vulgare, the common pill bug or potato bug, an isopod native to Europe and found across the world Aulacomya ater, a synonym of Aulacomya atra, a saltwater mussel found in the Southern Hemisphere Auleutes ater, a weevil found in North America