Scaly-headed Parrot

Here the details of the Scaly-headed Parrot named bird below:

SCI Name:  Pionus maximiliani
Protonym:  Psittacus Maximiliani NovaActaAcad.Caes.Leop.Carol. 10 p.72
Taxonomy:  Psittaciformes / Psittacidae / Pionus
Taxonomy Code:  schpar1
Type Locality:  Brazil, restricted to Vigosa on the Rio Peruhype, south of Caravellas, Bahia, by Helmayr, Field Mus. Nat. Hist. Publ., Zool. Ser., 12, 1929, p. 450, note.
Author:  Kuhl
Publish Year:  1820
IUCN Status:  Least Concern

DEFINITIONS

PIONUS
(Psittacidae; Ϯ Blue-headed Parrot P. menstruus) Gr. πιων piōn, πιονος pionos  fat, obese; "Genus XVII.  Pionus*) Wagl.  Maïtaca.  Rostrum subintumidum; nares, lingua et pedes Psittacorum; cauda abbreviata, aequalis, alis magnis fere tecta; caput magnum; corpus breve, crassum.  Sexus colore non variant.  ...  Species: A. Rostro subparvo, compressiusculo: α. crisso rubro: 1. P. menstruus.  —  2. P. Maximiliani.  —  3. P. senilis.  —  4. P. purpureus.  —  5. P. sordidus.   ...   *) Πιων obesus. — Maïtaca audiunt hae aves apud indigenas Brasiliae" (Wagler 1832); "Pionus Wagler, Abh. K. Bayer. Akad. Wiss., Math.-Phys. Kl., 1, 1832, p. 497. Type, by subsequent designation, Psittacus menstruus Linné (G. R. Gray, List Gen. Bds., 1840, p. 52)." (Peters 1937, III, 214).
Var. Pionias, Pione.

maximiliani
● Maximilian I Joseph Count-Palatine of Zweibrücken Prince-Elector and King of Bavaria (1756-1825; reigned 1799-1825) (syn. Anodorhynchus hyacinthinus).
● Maj.-Gen. Maximilian Alexander Philipp Graf zu Wied-Neuwied and Prinz zu Wied (1782-1867) Prussian Army, collector, explorer in Brazil 1815-1817 and North America 1832-1834 (syn. Conopophaga melanops, syn. Laniocera hypopyrra, Melanopareia, ‡syn. Neomorphus geoffroyi (Laurent Raty in litt.), subsp. Pitangus sulphuratus, Pionus, syn. Riparia riparia, Sporophila (ex Fringilla crassirostris zu Wied, 1830), syn. Thraupis cyanocephala).
● Maximilian Josèph Eugéne Auguste Napoléon de Beauharnais (1817-1852) 3rd Duke of Leuchtenburg, 3rd Prince of Eichstätt, and Prince Romanovsky, husband to Grand Duchess Maria Nikolayevna of Russia (?syn. Trochilus sp.)

SUBSPECIES

Scaly-headed Parrot (maximiliani)
SCI Name: Pionus maximiliani maximiliani
maximiliani
● Maximilian I Joseph Count-Palatine of Zweibrücken Prince-Elector and King of Bavaria (1756-1825; reigned 1799-1825) (syn. Anodorhynchus hyacinthinus).
● Maj.-Gen. Maximilian Alexander Philipp Graf zu Wied-Neuwied and Prinz zu Wied (1782-1867) Prussian Army, collector, explorer in Brazil 1815-1817 and North America 1832-1834 (syn. Conopophaga melanops, syn. Laniocera hypopyrra, Melanopareia, ‡syn. Neomorphus geoffroyi (Laurent Raty in litt.), subsp. Pitangus sulphuratus, Pionus, syn. Riparia riparia, Sporophila (ex Fringilla crassirostris zu Wied, 1830), syn. Thraupis cyanocephala).
● Maximilian Josèph Eugéne Auguste Napoléon de Beauharnais (1817-1852) 3rd Duke of Leuchtenburg, 3rd Prince of Eichstätt, and Prince Romanovsky, husband to Grand Duchess Maria Nikolayevna of Russia (?syn. Trochilus sp.)

Scaly-headed Parrot (siy)
SCI Name: Pionus maximiliani siy
siy
Güaraní name Síh’i for the Scaly-headed Parrot ; "NÚM. CCLXXXVII.  DEL SÍY.  Es comun en el Paraguay, pero no sé que pase los 28 grados. Sus bandadas son pocó numerosas, no hace caso de naranjas, y destruye mucho maiz. Canta su nombre agriamente, y por él le conocen todos." (de Azara 1805) (subsp. Pionus maximiliani).

Scaly-headed Parrot (melanoblepharus)
SCI Name: Pionus maximiliani melanoblepharus
melanoblepharus
Gr. μελας melas, μελανος melanos black, dark; βλεφαρον blepharon eyelid, eye.

Scaly-headed Parrot (lacerus)
SCI Name: Pionus maximiliani lacerus
lacerus
L. lacer, lacera  torn, mangled, mutilated.