Amazilia de Tobago

Identificación

The copper-rumped hummingbird is 9 to 11 cm (3.5 to 4.3 in) long. Males weigh 4.6 to 4.7 g (0.16 to 0.17 oz) and females 3.5 to 4.2 g (0.12 to 0.15 oz). The nominate subspecies S. t. tobaci is the largest. Both sexes of all subspecies have a straight, medium length, blackish bill with a pinkish base to the mandible. Males of S. t. tobaci have bronze-green upperparts with purple-red uppertail coverts. They have dark golden-green underparts with reddish brown undertail coverts. Their tail is purplish black. Adult females are similar though their upperparts are a less intense bronze-green and they have some whitish on the chin and upper throat. Juveniles resemble females but have some grayish brown on the throat and belly.<p>Subspecies S. t. monticola is darker than the nominate and has a steel blue to violet-blue tail. S. t. feliciae's back is more of a golden-green than the nominate's and its tail is bluish black. S. t. caudata has a dark blue tail. S. t. aliciae has some copper in its upperparts, a blue-black tail, and cinnamon-rufous undertail coverts. S. t. erythronotos has slightly darker underparts than the nominate and some dark purplish in the uppertail coverts. S. t. caurensis has a grayer rump and uppertail coverts than the nominate, a dark purplish tail, and bluish black undertail coverts.

Taxonomía

The copper-rumped hummingbird was formally described in 1788 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with all the other hummingbirds in the genus Trochilus and coined the binomial name Trochilus tobaci. Gmelin based his description on the "Tobago Humming-Bird" that had been described in 1782 by the English ornithologist John Latham in his A General Synopsis of Birds. The copper-rumped hummingbird was formerly placed in the genus Amazilia. A molecular phylogenetic study published in 2014 found that the genus Amazilia was polyphyletic. In the revised classification to create monophyletic genera, the copper-rumped hummingbird was moved by most taxonomic systems to the resurrected genus Saucerottia. However, BirdLife International's Handbook of the Birds of the World (HBW) retains it in Amazilia.<p>The genus Saucerottia had been introduced in 1850 by the French naturalist Charles Lucien Bonaparte. The genus name is from the specific epithet saucerrottei for the steely-vented hummingbird, the type species. The epithet was coined in 1846 by Adolphe Delattre and Jules Bourcier to honor the French physician and ornithologist Antoine Constant Saucerotte. The specific epithet tobaci is from the island of Tobago, the type locality.<p>These seven subspecies of copper-rumped hummingbird are recognised by world-wide taxonomic systems:

Nombre científico

Saucerottia tobaci

Autoridad

(Gmelin, JF, 1788)

Orden

Apodiformes

Familia

Trochilidae

Género

Saucerottia

Distribución y hábitat

The subspecies of copper-rumped hummingbird are found thus:<p>Specimens of this species labeled as from Grenada are believed to have been actually collected on Tobago, and "the occurrence of the species in the Lesser Antilles is doubtful."<p>The copper-rumped hummingbird inhabits a wide variety of forest types including gallery forest, cloudforest, rainforest, and secondary forest. S. t. erythronotos and S. t. tobaci are also found in savanna, plantations, and gardens. Most subspecies range in elevation from sea level to 1,000 m (3,300 ft) though monticola and feliciae can be found as high as 2,000 m (6,600 ft) and aliciae is seldom found at low elevation.

Migración

Especie residente

Comportamiento

Patrón migratorio: Especie residente.

Conservación

Tendencia poblacional

unknown