Class Mammalia Linnaeus, 1758 - mammals
   Order Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
     Family Bovidae Gray, 1821 - antelope, cattle, bison, buffalo, goats, and sheep
       Subfamily Cephalophinae Gray, 1872
         Genus Cephalophus Smith, 1827 - forest duikers
           01 Cephalophus adersi Thomas, 1918 - Aders' duiker
           02 Cephalophus callipygus Peters, 1876 - Peters' duiker
           03 Cephalophus dorsalis Gray, 1846 - bay duiker
           04 Cephalophus harveyi Thomas, 1893 - Harvey's duiker
           05 Cephalophus jentinki (Thomas, 1892) - Jentink's duiker
           06 Cephalophus leucogaster Gray, 1873 - white-bellied duiker
           07 Cephalophus maxwellii (H. Smith, 1827)
           08 Cephalophus monticola (Thunberg, 1789)
           09 Cephalophus natalensis A. Smith, 1834 - red forest duiker
           10 Cephalophus niger Gray, 1846 - black duiker
           11 Cephalophus nigrifrons Gray, 1871 - black-fronted duiker
           12 Cephalophus ogilbyi (Waterhouse, 1838) - Ogilby's duiker
           13 Cephalophus rubidus Thomas, 1901
           14 Cephalophus rufilatus Gray, 1846 - red-flanked duiker
           15 Cephalophus silvicultor (Afzelius, 1815) - light-backed duiker
           16 Cephalophus spadix True, 1890 - Abbott's duiker
           17 Cephalophus weynsi Thomas, 1901
           18 Cephalophus zebra (Gray, 1838) - banded duiker