Black-tailed Gull

Here the details of the Black-tailed Gull named bird below:

SCI Name:  Larus crassirostris
Protonym:  Larus crassirostris Nouv.Dict.Hist.Nat. 21 p.508
Taxonomy:  Charadriiformes / Laridae / Larus
Taxonomy Code:  bktgul
Type Locality:  Nagasaki, Japan, ex pi. 57 of Krusenstern''s Voyage.
Author:  Vieillot
Publish Year:  1818
IUCN Status:  Least Concern

DEFINITIONS

LARUS
(Laridae; Ϯ Great Black-backed Gull L. marinus) L. larus  rapacious seabird, probably a gull  < Gr. λαρος laros  voracious seabird, perhaps a gull; the Great Black-backed Gull, the largest member of the Laridae, breeds only on sea coasts, where it is a true predator; "69. LARUS.  Rostrum edentulum, rectum, cultratum, apice declive: Mandibula inferior infra apicem gibba.  Nares lineares, antice latiores.   ...   Pulli primi anni plurumque in his grisei sunt; unde speciei multiplicatio." (Linnaeus 1758); "Larus Linné, Syst. Nat., ed. 10, 1, 1758, p. 136. Type, by subsequent designation, Larus marinus Linné (Selby, Cat. Gen. Subgen. Types Aves, 1840, p. 48)" (Peters 1934, II, 313). Linnaeus's Larus comprised six species (L. tridactylus, L. canus, L. marinus, L. fuscus, L. Atricilla, L. parasiticus).
Synon. Adelarus, Atricilla, Blasipus, Bruchigavia, Caturates, Chroicocephalus, Cirrhocephala, Clupeilarus, Dominicanus, Einalia, Epitelarus, Gabianus, Gavia, Gavina, Gelastes, Glaucus, Hydropeleia, Ichthyaetus, Lambruschinia, Laroides, Lencus, Leucophaeus, Melagavia, Melanolarus, Microlarus, Misamichus, Ocyplanus, Pacificolarus, Plautus, Procellarus.

crassirostra / crassirostre / crassirostris
L. crassus  thick, heavy; -rostris  -billed  < rostrum  beak.
● ex “Coucou à Gros Bec” of Levaillant 1806, pl. 214 (syn. Eudynamys scolopaceus).
● ex “Alouette à Gros Bec” of Levaillant 1806, pl. 193 (syn. Galerida magnirostris).
● ex “Thick-billed Grosbeak” of Latham 1783 (Oryzoborus).
● ex “Thick-billed Thrush” of Latham 1783 (‡syn. Turnagra capensis).