snaggletooth

A. niger may refer to:

Aaptos niger, a sea sponge
Abacetus niger, a ground beetle
Acanthus niger, a synonym of Acanthus mollis, a plant native to the Mediterranean
Achalinus niger, a Taiwanese snake
Acromyrmex niger, an ant species found in southern Brazil and Paraguay
Afroeurydemus niger, a Congolese ground beetle
Agelastes niger, the black guineafowl, a bird species found in humid forests of Central Africa
Allocyttus niger, the black oreo, a fish species found around Australia and New Zealand
Allogaster niger, a Nigerian longhorn beetle
Amblytelus niger, a ground beetle
Amphicrossus niger, a North American sap beetle
Andricus niger, a gall wasp species in the genus Andricus
Andropogon niger, a synonym of Sorghum bicolor, commonly called sorghum
Aneides niger, the Santa Cruz black salamander
Aparallactus niger, an African snake
Aspergillus niger, the black mold, a fungus species
Aspidophorus niger, a synonym of Agonopsis chiloensis, commonly called the snailfish
Astronesthes niger, commonly known as the snaggletooth, a deep-sea fish
Austropyrgus niger, a freshwater snail