A. nigricans

A. nigricans may refer to:
 * Acacia nigricans, a wattle species endemic to an area on the south coast of Western Australia
 * Acanthurus nigricans, a tang fish species from the Eastern Indian Ocean
 * Acronicta nigricans, a moth species found in western China
 * Aspideretes nigricans, the black soft-shelled turtle or Bostami turtle, a freshwater turtle species found in India and Bangladesh
 * Avrainvillea nigricans, an algae species in the genus Avrainvillea

Synonyms

 * Australorbis nigricans, a synonym for Biomphalaria tenagophila, an air-breathing freshwater snail species