The twelve-wired bird-of-paradise (Seleucidis melanoleucus) is a medium-sized, approximately long, velvet black and yellow bird-of-paradise. The male has a red iris, long black bill and rich yellow plumes along his flanks. From the rear of these plumes emerge twelve blackish, wire-like filaments, which bend back near their bases to sweep forward over the bird's hindquarters. The female is a brown bird with black-barred buffy underparts. Their feet are strong, large-clawed and pink in color.

The twelve-wired bird-of-paradise (Seleucidis melanoleucus) is a medium-sized, approximately long, velvet black and yellow bird-of-paradise. The male has a red iris, long black bill and rich yellow plumes along his flanks. From the rear of these plumes emerge twelve blackish, wire-like filaments, which bend back near their bases to sweep forward over the bird's hindquarters. The female is a brown bird with black-barred buffy underparts. Their feet are strong, large-clawed and pink in color.