Cepphus
Black guillemot ( Cepphus grylle)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Charadriiformes
Family:	Alcidae
Genus:	Cepphus Pallas, 1769
Type species
Cepphus lacteolus[1] Pallas, 1769
Species
Cepphus grylle Cepphus columba Cepphus carbo

Cepphus is a genus of seabirds in the auk family also referred to as true guillemots or, in North America, simply as guillemots. The genus name Cepphus is from Ancient Greek κέπφος kepphos,^[2] a pale waterbird mentioned by Greek authors including Aristotle.^[3] The English word "guillemot" is from French guillemot probably derived from Guillaume, "William".^[4] "Murre" is of uncertain origins but may imitate the call of the common guillemot.^[5]

These are medium-sized birds with mainly black plumage in the breeding season, thin dark bills and red legs and feet. Two species have white wing patches, the third has white facial “spectacles”. They are much paler in winter plumage, mottled above and white below.

The breeding habitat is rocky shores and islands on the coasts of the northern Atlantic and Pacific Oceans. They usually lay their eggs in rocky sites near water.

These birds may overwinter in their breeding areas, moving to open waters, if necessary, but usually not migrating very far south.

They dive for food from the surface, swimming underwater. They mainly eat fish and crustaceans, also some molluscs, insects and plant material.

The species are:

Image	Scientific name	Common name	Distribution
	Cepphus grylle	Black guillemot or tystie	Circumpolar: Arctic coasts, North Atlantic, Alaska
	Cepphus columba	Pigeon guillemot	Kuril Islands and the Kamchatka Peninsula in Siberia to coasts in western North America from Alaska to California.
	Cepphus carbo	Spectacled guillemot	Sea of Okhotsk and the Kuril Islands in Russia and on the northern island of Hokkaidō in Japan

There are also fossil forms:

• Cepphus olsoni Howard, 1982 (San Luis Rey River Late Miocene - Early Pliocene of W USA)
• Cepphus storeri Harrison, 1977 (Red Crag of Suffolk Late Miocene - England
• Cepphus cf. columba (Lawrence Canyon Early Pliocene of W USA)
• Cepphus cf. grylle (San Diego Late Pliocene, W USA)

The latter two resemble the extant species, but because of the considerable distance in time or space from their current occurrence may represent distinct species.