S. nigricans may refer to: Santiria nigricans, a plant species Sayornis nigricans, the black phoebe, a bird species Scambus nigricans, an ichmeunon wasp species found in the United Kingdom Serpophaga nigricans, the sooty tyrannulet, a bird species Siphona nigricans, Villeneuve, 1930, a fly species in the genus Siphona Stegastes nigricans, a damselfish species Strophius nigricans, Keyserling, 1880, a spider species in the genus Strophius and the family Thomisidae found in Trinidad, Peru, Brazil and Paraguay
Synonyms Salix nigricans, a synonym for Salix myrsinifolia, a willow species native to Europe and Western Siberia
See also Nigricans (disambiguation)