This genus is distinguished by plumage more than by structure; it differs from all other Ducks in having a pink head and a dark body. The sexes differ but little from each other. The egg is peculiar and very short, subspherical in fact. The bill is lower at the base than that of Sarcidiornis, but otherwise similar. The bulba ossea at the lower end of the male trachea is very peculiarly formed, being swollen on both sides and anteriorly (see Garrod, P. Z. S. 1875, p. 153).
Only one species is known.