Black-throated toucanet

The black-throated toucanet was originally described in the genus Pteroglossus. What is now the black-throated toucanet was three of many subspecies of the then emerald toucanet (Aulacorhynchus prasinus sensu lato). In 2008 the International Ornithological Committee (IOC) split 10 of those subspecies to create seven new species, one of which is the black-throated toucanet, and retained four of them as subspecies of their current emerald toucanet sensu stricto. BirdLife International's Handbook of the Birds of the World (HBW) concurred. However, the North and South American Classification Committees of the American Ornithological Society and the Clements taxonomy declined to follow them. In 2017 they did split the emerald toucanet into two species, the northern (A. prasinus) and southern (A. albivitta) emerald-toucanets, each with seven subspecies. They treat the IOC's "black-throated" as three subspecies of the southern emerald-toucanet.[3][4][2][5][6][7][8]

Three subspecies of black-throated toucanet are recognized by the IOC and HBW:[2][5]

• "Black-billed toucanet" (A. a. cyanolaemus) - Gould, 1866
• A. a. dimidiatus - Ridgway, 1886
• The nominate A. a. atrogularis - (Sturm, J.H.C.F. & Sturm, J.W., 1841)

Like other toucans, the black-throated toucanet is brightly marked and has a large bill. Adults are 33 to 38 cm (13 to 15 in) long and weigh about 120 to 210 g (4.2 to 7.4 oz). The sexes are alike in appearance although the female generally is smaller and shorter-billed. The bills of A. a. dimidiatus and A. a. atrogularis are black a wide yellow stripe along the culmen; that of A. a. cyanolaemus is black with the only yellow on the tip of the maxilla. The bills of all three have a white vertical strip at the base. All three subspecies have plumage that is mainly green like that of other members of genus Aulacorhynchus, and is somewhat lighter below than above. Subpecies A. a. dimidiatus and A. a. atrogularis have black throats and A. a. cyanolaemus a blue throat. All subspecies have olive green legs and feet with dusky yellow soles.[9]

The three subspecies of white-throated toucanet are found thus:[2][9]

• A. a. cyanolaemus, the eastern slope of the Andes of southeastern Ecuador and northern Peru
• A. a. dimidiatus, the Andean foothills and western Amazonia of eastern Peru, western Brazil, and northern Bolivia
• A. a. atrogularis, the eastern slope of the Andes from central Peru to central Bolivia

The black-throated toucanet primarily inhabits the interior of humid montane forest but is also found in more open landscapes like the forest's edge, secondary forest, plantations, and clearings with scattered trees. In Amazonia it is also found in lowland evergreen forest.[9]

The IUCN has assessed the black-throated toucanet as being of Least Concern. It has a large range, but its population size is not known and is believed to be decreasing. No immediate threats have been identified.[1] It is "vulnerable to habitat destruction".[9]