Marsh tern

Marsh terns

Black-fronted Tern Chlidonias albostriatus
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Charadriiformes
Family:	Sternidae
Genus:	Chlidonias Rafinesque, 1822
Species
Chlidonias niger Chlidonias leucopterus Chlidonias hybridus Chlidonias albostriatus

The name marsh tern refers to terns of the genus Chlidonias, which are typically found in freshwater marshes, rather than coastal locations.

There are four species:

Black Tern, Chlidonias niger
White-winged Tern or White-winged Black Tern, Chlidonias leucopterus
Whiskered Tern, Chlidonias hybridus
The Black-fronted Tern, Chlidonias albostriatus (formerly Sterna albostriata) is now also recognized to belong to this genus (Bridge et al., 2005).

The Black-bellied Tern (Sterna acuticauda) and the White-cheeked Tern (Sterna repressa) might also be placed in Chlidonias.

References

Bridge, E. S.; Jones, A. W. & Baker, A. J. (2005): A phylogenetic framework for the terns (Sternini) inferred from mtDNA sequences: implications for taxonomy and plumage evolution. Molecular Phylogenetics and Evolution 35: 459–469. PDF fulltext.