Lerwini
Monotypic tribe basal to the erectile clade of Phasianinae.
Lerwini is a taxonomic tribe that contains a single living species, the snow partridge (Lerwa lerwa). This tribe is recognized as the most basal member of the 'erectile clade' within the subfamily Phasianinae, making it significant for understanding the early divergence of pheasant-like birds. The snow partridge is distributed across high-altitude Himalayan regions of Pakistan, China, India, and Nepal.
- field
- Ornithology, Taxonomy
- known_for
- Being the most basal member of the erectile clade of Phasianinae
- species
- Lerwa lerwa (snow partridge)
Lore & Background
The snow partridge was first described by Brian Houghton Hodgson in 1833, who placed it in the genus Perdix as Perdix lerwa. Hodgson later gave it the genus name Lerwa based on the Bhutia name for it in Nepal. The species has been retained in this monotypic genus due to various peculiarities including the tarsus feathering and the lack of clear sexual dimorphism in plumage.
Reader's Guide
The tribe Lerwini is significant in avian taxonomy because it represents the most basal lineage within the 'erectile clade' of the subfamily Phasianinae. This placement suggests that the snow partridge retains ancestral characteristics that can help researchers understand the evolutionary history of pheasants and related gamebirds. The species is found in alpine pastures and open hillsides above the treeline in the Himalayas, from Pakistan to Arunachal Pradesh, at altitudes mainly between 3000 and 5000 meters. It is not as wary as the Himalayan snowcock and is more approachable, which has led to hunting pressure and population declines in some areas. The snow partridge is generally considered of low conservation concern due to its large range. Its behavior includes forming small groups of 6 to 8 birds, feeding on mosses, lichens, berries, and plant shoots, and breeding from May to July with the male acting as sentinel while the female incubates 3 to 5 eggs.
Did You Know?
- The snow partridge is the only species within its genus Lerwa.
- Males have a blunt spur on the tarsus, while females lack spurs.
- A species of bird louse, Chelopistes lervicola, has been described as an ectoparasite of this species.
- Downy chicks resemble the chicks of the blood pheasant.
Frequently Asked Questions
What is Lerwini?
Lerwini is a monotypic bird tribe within the subfamily Phasianinae that contains only one living species, the snow partridge (Lerwa lerwa). It sits at the very base of the so-called 'erectile clade,' representing the earliest branching lineage among pheasant-like birds.
What species is included in the tribe Lerwini?
The tribe is monotypic, meaning it holds just a single species: the snow partridge, Lerwa lerwa. No other living or recently extinct species are assigned to this group.
Why is Lerwini important in pheasant taxonomy?
Because it branches off before all other members of the erectile clade, Lerwini provides a critical reference point for reconstructing how early pheasant lineages diverged. Its position helps ornithologists calibrate the timing and pattern of evolutionary splits within Phasianinae.
Where does the snow partridge live?
Lerwa lerwa is a high-altitude specialist found across the Himalayan range, with populations in Pakistan, northern India, Nepal, and western China. It typically occupies alpine and subalpine zones well above the tree line.
How does Lerwini differ from other Phasianinae tribes?
Unlike most pheasant tribes that contain multiple closely related genera, Lerwini is defined by a single genus and species. Its distinguishing feature is its basal phylogenetic position, separating it from the more derived groups that make up the rest of the erectile clade.
More in Bird tribes 1-24
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