E. nigricans

E. nigricans may refer to:
 * Enchelycore nigricans, the mottled conger moray or mulatto conger, a moray eel species found in the Atlantic and Pacific Oceans
 * Endochironomus nigricans, a non-biting midge species in the genus Endochironomus found in Europe
 * Enneapogon nigricans
 * Epidendrum nigricans, Schltr., 1913, an orchid species in the genus Epidendrum
 * Euxesta nigricans, a picture-winged fly species
 * Euxoa nigricans, the garden dart, a moth species found throughout Europe
 * Evarcha nigricans, Dalmas, 1920, a jumping spider species in the genus Evarcha found in Tunisia