Tern
Species

The cladogram shows the relationships between the tern genera, and the currently recognised species, based on mitochondrial DNA studies, are listed below:

In addition to extant species, the fossil record includes a Miocene palaeospecies, Sterna milne-edwardsii.

The genera Anous, Procelsterna and Gygis are collectively known as noddies, the Chlidonias species are the marsh terns, and all other species comprise the sea terns.
oulipo:avoid_letter[a]