Clangula Histrionicus Polysticta †Camptorhynchus Somateria Melanitta Bucephala Mergellus Lophodytes Mergus The sea ducks (Mergini) are a tribe of the duck subfamily of birds, the Anatinae.

Some authorities separate the group as a subfamily, while others remove some genera.

The fish-eating members of this group, such as the mergansers and smew, have serrated edges to their bills to help them grip their prey and are often known as "sawbills".

Below is a phylogeny based on a mitogenomic study of the placement of the Labrador duck and the diving "goose" Chendytes lawi.

[1] Clangula hyemalis Histrionicus histrionicus Polysticta stelleri †Camptorhynchus labradorius Somateria fischeri Somateria mollissima Somateria spectabilis Melanitta nigra Melanitta deglandi Melanitta perspicillata Bucephala albeola Bucephala clangula Bucephala islandica Mergellus albellus Mergus serrator Lophodytes cucullatus Mergus merganser Mergus octosetaceus Mergus squamatus