Arses telescopthalmus Lesson & Garnot, 1827

Male is strikingly black and white, has top of head to below eye black, chin black, upperparts entirely glossy black except for large erectile ruff of white collar and side of neck, and white scapulars, lower back and rump; white below; iris dark brown, prominent fleshy blue eye wattle; bill pale blue-grey; legs blue-grey. Female is very different from male, has black crown and ear-coverts, orange-buff hindneck-collar, rich rufous-brown upperparts, orange-buff chin, throat and breast, belly paler; has blue eye wattle. Immature is similar to female but duller, has bill light horn-coloured, legs light brown. Races differ mainly in female plumage: harterti female has belly white; lauterbachi female has pale rufous belly; aruensis female duller and darker above than nominate, and smaller; batantae larger, but otherwise very similar to nominate.