H. nigricans

H. nigricans may refer to:
 * Haplochromis nigricans, Boulenger, 1906, a fish species in the genus Haplochromis
 * Heliotropium nigricans, a plant species endemic to Yemen
 * Hexatoma nigricans, Edwards, 1927, a crane fly species in the genus Hexatoma
 * Hirundo nigricans, the tree martin, a bird species found in Australia
 * Hypoplectrus nigricans, a hamlet fish from the Western Atlantic
 * Hypentelium nigricans, the northern hogsucker, a sucker fish species found in the rivers of the Mississippi basin from Oklahoma and Alabama northward to Minnesota

Synonyms

 * Hypostomus nigricans, a synonym for Parancistrus aurantiacus, a catfish species