Brazilian Merganser

Here the details of the Brazilian Merganser named bird below:

SCI Name:  Mergus octosetaceus
Protonym:  Mergus octosetaceus Nouv.Dict.Hist.Nat. 14 p.222
Taxonomy:  Anseriformes / Anatidae / Mergus
Taxonomy Code:  bramer1
Type Locality:  Brazil.
Author:  Vieillot
Publish Year:  1817
IUCN Status:  Critically Endangered

DEFINITIONS

MERGUS
(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)).

octosetaceus
L. octo  eight; Mod. L. setaceus  bristled  < L. saeta or seta  bristle; "Harle a huit brins. Cette espèce du Brésil a une huppe composée de huit plumes, longues de deux pouces, étroites, et à barbes désunies; cette huppe est posée sur l'occiput" (Vieillot 1817) (Mergus).