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The Guillemots are seabirds in the auk family. They comprise two genera: Uria and Cepphus. The former are relatives of the Razorbill, Dovekie and the extinct Great Auk and together make up the tribe Alcini, while the latter form a tribe of their own, the Cepphini. Buffon says that this name comes from Welsh: Gillem.

• Uria
  • Common Guillemot or Common Murre, Uria aalge
  • Brünnich's Guillemot or Thick-billed Murre, Uria lomvia

Some prehistoric species are also known:

• Uria bordkorbi (Monterey or Sisquoc Late Miocene of Lompoc, USA)
• Uria affinis (Late Pleistocene of E USA) - possibly a subspecies of U. lomvia
• Uria paleohesperis

U. brodkorbi is interesting insofar as it is the only known occurrence of the Alcini tribe in the temperate to subtropical Pacific, except for the very fringe of the range of U. aalge. It suggests that the Uria species, which are the sister taxon to all the other Alcini, and like them are usually believed to have evolved in the Atlantic, may have evolved in the Caribbean or possibly close to the Isthmus of Panama. The modern Pacific distribution would then be part of a later arctic expansion, whereas most other auk lineages form clades with a continuous range in the Pacific, from arctic to subtropical waters.

• Cepphus
  • Black Guillemot or Tystie, Cepphus grylle
  • Pigeon Guillemot, Cepphus columba
  • Spectacled Guillemot, Cepphus carbo

As in other genera of auks, fossils of prehistoric forms of Cepphus have been found:

• Cepphus olsoni (San Luis Rey River Late Miocene - Early Pliocene of W USA)
• 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, they may represent distinct species.

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