Any of about 25 species of long-tusked Leontopithecus (or Leontideus , according to some authorities) and Saguinus .
Tamarins are 8–12 in. (20–30 cm) long, excluding the 12–16-in. (30–40-cm) tail. The emperor tamarin ( Saguinus imperator ) has long, grizzled, gray fur; a reddish tail, and a long white moustache. The three species of Leontopithecus are endangered. See also {{link=golden lion tamarin">golden lion tamarin .