Aequornithes

Aequornithes (/iːkwɔːrˈnɪθiːz/, from Latin aequor, expanse of water + Greek ornithes, birds), or core water birds, are defined in the PhyloCode as "the least inclusive crown clade containing Pelecanus onocrotalus and Gavia immer", that is, the last common ancestor of the great white pelican and the common loon, as well as its descendants, extinct and extant.

The monophyly of the group is currently supported by several molecular phylogenetic studies.

Aequornithes includes the clades Gaviiformes (loons), Sphenisciformes (penguins), Procellariiformes (petrels and albatrosses), Ciconiiformes (storks), Suliformes (gannets and cormorants) and Pelecaniformes (pelicans). It does not include several unrelated groups of aquatic birds such as flamingos and grebes (Mirandornithes), shorebirds, gulls, and auks (Charadriiformes), or the Anseriformes (waterfowl).

Based on a whole-genome analysis of the bird orders, the kagu and sunbittern (Eurypygiformes) and the three species of tropicbirds (Phaethontiformes) together styled as the Eurypygimorphae are the closest sister group of the Aequornithes, in a clade later named Phaethoquornithes.