Glaucionetta Stejneger, Proc. U.S. Nat. Mus,, viii, p. 409 (1885).
Type by orig. desig., Anas clangula Linn.
In the genus Glaucionetta the bill is short, higher than broad at the base, not much flattened at the tip, tapering slightly throughout, more rapidly and rounded at the end; culmen very slightly concave; the nostrils are placed nearer to the tip than to the base of the bill, this being a feature found only in this duck; the lamellae. are short, stout and placed very close together; the tarsus is short and scutellate in front; the hind toe well developed with a broad lobe; the legs are placed far back, rendering the walk difficult and top-heavy; the wings are pointed; the tail long and strongly graduate.
The posterior end of the sternum is prolonged as in Merganser. Sexes differing.
This genus is a small one, containing three species, all Northern birds and all more sea birds than freshwater birds, except in the breeding-season, when they resort to inland lakes and marshes.
Only one species occurs in India and that only as a rare visitor.