Sooty Thrush

Here the details of the Sooty Thrush named bird below:

SCI Name:  Turdus nigrescens
Protonym:  Turdus nigrescens J.Orn. 8(1860) p.324
Taxonomy:  Passeriformes / Turdidae / Turdus
Taxonomy Code:  soorob1
Type Locality:  Volcan de Irazu, Costa Rica.
Author:  Cabanis
Publish Year:  1861
IUCN Status:  Least Concern

DEFINITIONS

TURDUS
(Turdidae; Ϯ Mistle Thrush T. viscivorus) L. turdus  thrush; "95. TURDUS.  Rostrum tereti-cultratum, maxilla superiore apice deflexo.  Nares nudæ, superne membranula semitectæ.  Lingua lacero-emarginata." (Linnaeus 1758); "Turdus Linnaeus, 1758, Syst. Nat., ed. 10, 1, p. 168. Type, by subsequent designation (Gray, 1840, List Gen. Birds, p. 27), Turdus viscivorus Linnaeus." (Ripley in Peters 1964, X, 177). Linnaeus's Turdus comprised sixteen species (T. viscivorus, T. pilaris, T. iliacus, T. musicus, T. Canorus, T. rufus, T. polyglottos, T. Orpheus, T. plumbeus, T. crinitus, T. roseus, T. Merula, T. torquatus, T. solitarius, T. arundinaceus, T. virens).   
Var. Turus, Trudus, Turtus, Curdus.     
Synon. Afrocichla, Arceuthornis, Cichlherminia, Cichloides, Cichloselys, Copsichus, Copsicus, Cossyphopsis, Galeoscoptes, Haplocichla, Hodoiporus, Iliacus, Ixocossyphus, Lamprophonus, Melizocincla, Meridiocichla, Merula, Merulissima, Mimocichla, Mimokitta, Nesocichla, Peliocichla, Petrocincla, Planesticus, Platycichla, Semimerula, Thoracocincla, Turdela, Turdicus.

turdus
L. turdus  thrush.
● ex “Grivetin” of Levaillant 1802, pl. 118 < French Grive thrush (syn. Erythropygia leucophrys).
● "89. Loxia Turdus F.  ...  Habitat in insula australi Novae Zeeelandiae, simillima Turdo, statura, colore, pedibus.  Corpus magnitudine Turdi viscivori, supra fuscum." (Forster 1844) (syn. Turnagra capensis).

nigrescens
L. nigrescens, nigrescentis  blackish  < nigrescere  to become black  < niger  black.