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
See also Nigricans (disambiguation)