Long-tailed Silky-flycatcher

Here the details of the Long-tailed Silky-flycatcher named bird below:

SCI Name:  Ptiliogonys caudatus
Protonym:  Ptilogonys caudatus J.Orn. 8(1860) p.402
Taxonomy:  Passeriformes / Ptiliogonatidae / Ptiliogonys
Taxonomy Code:  ltsfly1
Type Locality:  Irazu, Costa Rica.
Author:  Cabanis
Publish Year:  1861
IUCN Status:  Least Concern

DEFINITIONS

PTILIOGONYS
(Ptiliogonatidae; Ϯ Grey Silky-flycatcher P. cinereus) Gr. πτιλον ptilon  feather; γονυ gonu, γονατος gonatos  knee; "G. PTILIOGONYS. Swains. in Zool. Journ. No. 10.   26. Ptiliogonys cinereus.  Cinereous; chin and middle of the lateral tail feathers white; under tail covers yellow; wings and tail shining black.  Table land of Mexico. Real del Monte" (Swainson 1827); “There has been much diversity among writers in the spelling of the name of this genus, Mr Swainson, its author, having himself written it very differently. His first rendering of the name, however—Ptilogonys—is more nearly correct than the subsequent ones, as compounded of ptilon and gonu, or feathered knee, in allusion to the tuft of cottony feathers on the tibiae” (Baird 1866); "Ptilogonys Swainson, 1824, Cat. Exhib. called Modern Mexico, App., p. 4². Type, by monotypy, Ptilogonys cinereus Swainson.    Ptiliogonys Swainson, 1827, Phil. Mag., n. s., 1, fasc. 5, p. 368. Type, by monotypy, Ptiliogonys cinereus Swainson.   ...   ² Not seen. Sherborn (Ind. Anim., Sect. 2, 1922, p. xxxiv, cxx) states that he never saw the last (undated) appendix on page 4 of which Swainson (Zool. Illustr., ser. 2, 2, 1831, pl. 62) says the original description appears. As far as can be ascertained no one has been able to find it. The accustomed spelling of recent years is retained here." (Greenway in Peters IX 1960). However, Gregory & Dickinson 2012, concluded that, “Ptiliogonys is not an original spelling that requires correction, the spelling Ptilogonys is an incorrect subsequent spelling.”
Var. Ptiliogenys, Ptilogonys, Ptiliogonatus, Ptilogonatus, Ptiliosmatus, Pliliogonys.
Synon. Hypothymis, Sphenotelus.

caudata / caudatus
L. caudatus  tailed, having a (long/short) tail  < cauda  tail.
● ex “Parus caudatus” of Gessner 1555, Aldrovandus 1599, and Willughby 1676, “Long-tail’d Titmouse” of Ray 1713, and “Parus vertice albo, cauda corpore longiore” of Linnaeus 1746 (Aegithalos).
● ex “Merle vert à longue queue de Sénégal” of Brisson 1760 (Lamprotornis).
● ex “Gobe-mouche à longue queue de Madagascar” of d’Aubenton 1765-1781, pl. 248, fig. 1 (syn. Terpsiphone mutata).
● ex “Courly à col blanc de Cayenne” of d’Aubenton 1765-1781, pl. 976, and “Grand Courlis de Cayenne” of de Buffon 1770-1785 (Theristicus).