C. nigricans may refer to: * Caecilia nigricans, an amphibian species found in Colombia, Ecuador and Panama * , DC., a plant species in the genus Calyptranthes * , Roger, 1863, an ant species in the genus Camponotus * Carex nigricans, a species of sedge * Celaenorrhinus nigricans, the small banded flat, a butterfly species found in South and Southeast Asia * Cercomacra nigricans, the jet antbird, a bird species found in Brazil, Colombia, Ecuador, Panama and Venezuela * , Shiraki, 1968, an hoverfly species in the genus Chalcosyrphus * Chinemys nigricans, the red-necked pond turtle, a turtle species endemic to China * , a sea snail species in the genus Clanculus * Clarias nigricans, a catfish species only known from the Mahakam River in eastern Borneo * Claviceps nigricans a speci