(Anatidae; Ϯ Red-breasted Merganser M. serrator) L. mergus  type of waterbird, not further identified, mentioned by Pliny, Terentius Varro and the poet Horatius Flaccus  < mergere  to plunge in; "62. MERGUS.  Rostrum denticulatum, subulato-cylindricum apice adunco." (Linnaeus 1758); "Mergus Linnaeus, 1758, Syst. Nat., ed. 10, p. 129. Type, by subsequent designation (Eyton, 1838, Monogr. Anatidae, p. 76), Mergus castor Linnaeus = Mergus serrator Linnaeus." (Johnsgard in Peters 1979, I, ed. 2, 496). Linnaeus's Mergus comprised five species (M. cucullatus, M. Merganser, M. Serrator, M. Albellus, M. minutus).
Var. Mergis.
Synon. Merganser, Prister, Promergus, Serrator.
● (syn. Gavia Ϯ Great Northern Diver G. immer) "Genre de Plongeon.   Genus Mergi.  ...  LE GRAND PLONGEON . . .MERGUS MAJOR" (Brisson 1760); based on "Colymbis" of Gessner 1555, "Colymbus maximus" of Jonston 1650-1653 and other authors, and "Imber" of the Norwegians and Faeroese; "MERGVS. Taucher.  ...  Mergus stellatus. Le petit Plongeon. Gestirnte Halbente.  ...  Mergus septentrionalis. La Plongeon à gorge rouge. Lumme.  ...  Mergus glacialis. Le grand Plongeon tacheté. Hymber." (Schaeffer 1789). 
● (syn. Uria Ϯ Common Guillemot U. aalge) "XIII. Mergus  **Lomvia.   Guillemot.   le Guillemot" (Tunstall 1771 (ed. Newton 1880)).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2018). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2018). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 15 December 2018).