A. brunneus

A. brunneus may refer to:

• Abacetus brunneus, a ground beetle
• Abraeus brunneus, a synonym of Parepierus brunneus, a clown beetle
• Acanthiophilus brunneus, a fruit fly found in Africa
• Aderpas brunneus, a longhorn beetle
• Agabus brunneus, the brown diving beetle, found in England
• Agniohammus brunneus, a longhorn beetle found in Borneo
• Allobates brunneus, the Chupada rocket frog, an amphibian found in South America
• Ameiurus brunneus, the snail bullhead, a freshwater fish found in the United States
  • Amiurus brunneus, a synonym of Ameiurus brunneus
• Andricus brunneus, the clustered gall wasp, found in North America
• Anolis brunneus, a lizard found in the Bahamas
• Apristurus brunneus, the brown catshark, found in the Pacific Ocean
• Aspergillus brunneus, a fungus
• Ataxia brunneus, a synonym of Ataxia brunnea, a longhorn beetle found in the United States
• Attagenus brunneus, a carpet beetle found in North America and Europe