The rufous-faced crake (Rufirallus xenopterus) is a species of bird in subfamily Rallinae of family Rallidae, the rails, gallinules, and coots. It is found in Bolivia, Brazil, and Paraguay. This species was formerly placed in the genusLaterallus.
The rufous-faced crake was formally described in 1934 by the American amateur ornithologist Boardman Conover based on a specimen collected near the town of Horqueta in central Paraguay. Conover assigned the species to the genus Laterallus and coined the binomial nameLaterallus xenopterus.[2][3] A molecular phylogenetic study published in 2023 found that the genus Laterallus was polyphyletic.[4] In the reorganization of the species to create monophyletic genera, the rufous-faced crake was placed with four other crakes in the genus Rufirallus that had been introduced in 1856 by the French naturalist Charles Lucien Bonaparte.[5] The genus name combines the Latinrufus meaning "rufous" with the genus Rallus that had been introduced by Carl Linnaeus in 1758 for the rails.[6] The specific epithet xenopterus combines the Ancient Greek ξενος/xenos meaning "different" with -πτερος/-pteros meaning "-winged".[7] The species is considered to be monotypic: no subspecies are recognised.[5]
Description
The rufous-faced crake is about 14cm (5.5in) long and weighs about 52g (1.8oz). The sexes are alike. They have a blue-gray bill, legs, and feet. They have a rufous face, hindneck, and upper back; a white throat and belly; and a buffy ochraceous foreneck and breast. Their upperwing coverts, secondaries, and scapulars have black and white bars as do their flanks. Their tail and undertail coverts are black.[8] The rufous-faced crake's song is "a drawn-out, slightly descending trill". It also makes "[s]oft call notes "piú piú'".[8]
Distribution and habitat
The rufous-faced crake is found in northeastern Bolivia's Beni Department, in several states in south-central Brazil, and in central Paraguay.[8] It is known from perhaps a dozen widely scattered locations in those areas[8] but "given the suitable habitat in intervening areas and elsewhere[...]the species may be more widespread and less local than suspected."[9] It inhabits marshes, especially the zones of moist to shallowly flooded tussocky or matted grass.[8]
Behavior
Feeding
The rufous-faced crake's foraging techniques and diet have not been documented.[8]
Breeding
Nothing is known about the rufous-faced crake's breeding biology.[8]
Conservation status
The International Union for Conservation of Nature (IUCN) originally assessed the rufous-faced crake as Threatened but since 1994 has rated it as Vulnerable. Its known areas of habitation are small and widely scattered, and its estimated population of 2500 to 10,000 mature individuals is believed to be decreasing. Loss of habitat by conversion to agriculture (corn and soybeans) and silviculture (Eucalyptus and pines) has played a major role in the species' decline. "The most significant threat is possibly the widespread use of pesticides, fertilisers and other chemicals."[1]
↑ Depino, E.A.; Pérez-Emán, J.L.; Bonaccorso, E.; Areta, J.I. (2023). "Evolutionary history of New World crakes (Aves: Rallidae) with emphasis on the tribe Laterallini". Zoologica Scripta. 52 (4). doi:10.1111/zsc.12595.
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