Gallirallus | |
---|---|
Weka, Gallirallus australis | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Gruiformes |
Family: | Rallidae |
Genus: | Gallirallus Lafresnaye, 1841 |
Species | |
1 living, and see text |
Gallirallus is a genus of rails that live in the Australasian-Pacific region. The genus is characterised by an ability to colonise relatively small and isolated islands and thereafter to evolve flightless forms, many of which became extinct following Polynesian settlement.
Following recent taxonomic revisions, there is only one known extant species in this genus along with several extinct species of dubious classification, with all other species being moved to Hypotaenidia , Cabalus , Lewinia , or Aptenorallus . [1]
Many of the rails, including the well-known weka of New Zealand, are flightless or nearly so. Many of the resultant flightless island endemics became extinct after the arrival of humans, which hunted these birds for food, introduced novel predators like rats, dogs or pigs, and upset the local ecosystems. A common Polynesian name of these rails, mainly relatives of G. philippensis, is veka/weka (in English, this name is generally limited to Gallirallus australis ).
On the other hand, Gallirallus species are (with the exception of the weka) notoriously retiring and shy birds with often drab coloration.
In the online list maintained by Frank Gill, Pamela Rasmussen and David Donsker on behalf of the International Ornithological Committee (IOC), the genus contains only one extant species: [1]
Image | Scientific name | Common name | Distribution |
---|---|---|---|
Weka | Gallirallus australis | New Zealand | |
These species were placed by BirdLife International and IUCN in the separate genus Hypotaenidia , but are still considered part of Gallirallus by The Clements Checklist of Birds of the World / eBird:
The Calayan rail (formerly Gallirallus calayanensis) was placed into the genus Aptenorallus in 2021. [2]
Aside from the weka, all species classified in the genus Gallirallus are only known from subfossil remains, having gone extinct in the Quaternary extinction event. Given the recent taxonomic changes that have led to the weka being the only remaining Gallirallus species, it is possible these may also belong to different genera, but are presently retained in Gallirallus due to uncertainty. [3]
Rails are a large, cosmopolitan family of small- to medium-sized terrestrial and/or semi-amphibious birds. The family exhibits considerable diversity in its forms, and includes such ubiquitous species as the crakes, coots, and gallinule; other rail species are extremely rare or endangered. Many are associated with wetland habitats, some being semi-aquatic like waterfowl, but many more are wading birds or shorebirds. The ideal rail habitats are marsh areas, including rice paddies, and flooded fields or open forest. They are especially fond of dense vegetation for nesting. The rail family is found in every terrestrial habitat with the exception of dry desert, polar or freezing regions, and alpine areas. Members of Rallidae occur on every continent except Antarctica. Numerous unique island species are known.
The Calayan rail is a flightless bird of the rail, moorhen, and coot family (Rallidae) that inhabits Calayan Island in the Philippines. It is the only member of the genus Aptenorallus. Though well known to natives of the island as the "piding", it was first observed by ornithologist Carmela Española in May 2004 and the discovery was officially announced on August 16, 2004. The formal description as a species new to science appeared in the journal Forktail.
The extinct Wake Island rail was a flightless rail and the only native land bird on the Pacific atoll of Wake. It was found on the islands of Wake and Wilkes, and Peale, which is separated from the others by a channel of about 100 meters. It was hunted to extinction during World War II.
The New Caledonian rail is a large and drab flightless rail endemic to the island of New Caledonia in the Pacific. It is Critically Endangered, may have gone extinct many decades ago already, and if it still exists it is one of the least-known living bird species.
The Tahiti rail, Tahitian red-billed rail, or Pacific red-billed rail is an extinct species of rail that lived on Tahiti. It was first recorded during James Cook's second voyage around the world (1772–1775), on which it was illustrated by Georg Forster and described by Johann Reinhold Forster. No specimens have been preserved. As well as the documentation by the Forsters, there have been claims that the bird also existed on the nearby island of Mehetia. The Tahiti rail appears to have been closely related to, and perhaps derived from, the buff-banded rail, and has also been historically confused with the Tongan subspecies of that bird.
The buff-banded rail is a distinctively coloured, highly dispersive, medium-sized rail of the rail family, Rallidae. This species comprises several subspecies found throughout much of Australasia and the south-west Pacific region, including the Philippines, New Guinea, Australia, New Zealand, and numerous smaller islands, covering a range of latitudes from the tropics to the subantarctic.
Cabalus is a disputed Oceanian genus of birds in the family Rallidae. Both species placed in the genus here were previously considered part of the genus Gallirallus, one was alternatively placed in Tricholimnas alone or together with the Lord Howe woodhen, and the other was initially included in Rallus.
Dieffenbach's rail, known in the Moriori language as meriki or mehoriki, is an extinct flightless species of bird from the family Rallidae. It was endemic to the Chatham Islands.
The Huahine rail was a species of bird in the family Rallidae. It was a medium-sized Gallirallus rail endemic to Huahine in the Society Islands of French Polynesia. It is known only from subfossil remains found at the Fa'ahia archaeological site on the island. Fa'ahia is an early Polynesian occupation site with radiocarbon dates ranging from 700 CE to 1200 CE. The rail is only one of a suite of birds found at the site which became extinct either locally or globally following human occupation of the island.
The great ground dove is an extinct species of bird in the family Columbidae. It was found in Mangaia in the southern Cook Islands, and in French Polynesia where subfossil bones between 1000 and 2000 years old have been found in the Marquesas, as well as between 750 and 1250 years old at the Fa'ahia early occupation site on Huahine in the Society Islands.
The Tubuai rail is an extinct species of flightless bird in the Rallidae, or rail family.
The Tahuata rail is an extinct species of flightless bird in the Rallidae, or rail family.
The Ua Huka rail is an extinct species of flightless bird in the Rallidae, or rail family.
The Nuku Hiva rail is an extinct species of flightless bird in the Rallidae, or rail family.
The Niue rail is an extinct species of flightless bird in the Rallidae, or rail family.
The Mangaia rail is an extinct species of flightless bird in the rail family, Rallidae.
The Mangaia crake is an extinct species of flightless bird in the rail family, Rallidae.
The ʻEua rail is an extinct species of flightless bird in the Rallidae, or rail family. It was described in 2005 from subfossil bones found on the island of ʻEua, in the Kingdom of Tonga of West Polynesia.
Hypotaenidia is a genus of birds in the family Rallidae. The genus is considered separate by the IOC and IUCN, while The Clements Checklist of Birds of the World / eBird consider the species to be part of Gallirallus. Since the mid-19th century, when these rather terrestrial birds were recognized to form a genus distinct from the decidedly aquatic Rallus, the validity of Hypotaenidia has been disputed.