Scaly-tailed possum

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Scaly-tailed possum
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Phalangeridae
Genus: Wyulda
Species:
W. squamicaudata
Binomial name
Wyulda squamicaudata
Alexander, 1918
Scaly-tailed Possum area.png
Scaly-tailed possum range

The scaly-tailed possum (Wyulda squamicaudata) is found in northwestern Australia, where it is restricted to the Kimberley.

Contents

They are light grey over most of the body and have relatively short ears and muzzle. The mostly hairless tail is able to curl around the branches of trees as the possum forages for food, its grasp is aided by rasp-ilke scales and is strong enough to hold its own weight. The species favours complex rocky terrain with dense thickets of vines and the fruiting trees that provide much of their diet.

Taxonomy

The new species was presented to the Royal Society of Western Australia in 1918 by the biologist Wilfred Backhouse Alexander, while he was employed by the Western Australian Museum, and published in the society's journal in the same year. The description was accompanied by a reproduction of a painting by George Pitt Morison, and two photographs of the specimen's skull were also included. [2] The holotype was reported to have been collected in the Kimberley region at Violet Valley Station, and forwarded to Walter Kingsmill who presented the specimen to the Perth Zoological Gardens. Alexander assigned the species to a new genus of the phalangerid family, Wyulda, deriving the name from an indigenous word used by the people at Lyons River for the local and common possum; the pronunciation provided by the author is "weeoolda". [3]

Aside from scaly-tailed possum, the recorded names for the species include ilangurra and yilangal (the latter by the Wunambal people of Mitchell Plateau [4] ). The describing author proposed the common name scaly-tailed opossum, but gave an alternative as scaly tailed phalanger if the use of the term for the American marsupial opossum was considered inappropriate. [3] As the common name implies, its distinguishing feature is a hairless, scaly tail.

Description

An arboreal species of the Phalangeridae family with short ears and muzzle, and a body with a stocky build. The total length of the head and body is 300 to 390 millimetres (12 to 15 in), the distinctive tail is 300 millimetres (12 in), and their weight ranges from 1.3 to 2.0 kilograms (2.9 to 4.4 lb). The coloration of the pelage is light grey with brown flecking over the upper parts, becoming a rufous colour toward the base of tail and over the rump; an indistinct mid-line extends along the back of the possum, from the tail to between the eyes. The fur at the underside is creamy white. A densely furred region extends a short distance over the base of the tail, which is otherwise naked. Wyulda squamicaudata is distinguished by rasp-like scales over the surface of their strongly prehensile tail. [5]

Reproduction of George Pitt Morison's painting of the species, published with the first description, 1918 Journal of the Royal Society of Western Australia Vol 4 Pl 1.jpg
Reproduction of George Pitt Morison's painting of the species, published with the first description, 1918

Wyulda squamicaudata is a slow growing species, the rate of increase in skull length for juveniles is 0.26 mm per day. The weight when the female reaches a reproductive age at two years old is 1.1 kg (2.4 lb). less than the weight range of fully mature individuals. There is no difference in weight between genders and is not known to be seasonally variable. [6]

The species has been allied within the family Phalangeridae as a relation of other Australasian genera, the cuscuses Phalanger and brushtail possums Trichosurus . [3] Superficially similar to other possum species, the observable differences from the commonly found possum Trichosurus vulpecula are the fox-like face, furry tail and larger of that species. Another rock inhabiting possum found in the region, the ringtail species Petropseudes dahli , has fur covering half the tail, patches of white near the ears, and a steep forehead and pointed muzzle when observed in profile. [5]

The parasites known to use Wyulda squamicaudata as a host include internal species, the cestode Bertiella trichosuri also found in possums of Trichosurus , Adelenema trichosuri and a species of Austrostrongylus , a genus associated with wallabies. [6]

Behaviour

Wyulda squamicaudata is a nocturnal animal that usually occurs alone. Their behaviour is discreet and shy while foraging in trees or over rocks. They demonstrate great agility when climbing, assisted by a prehensile tail that is strong enough to support themselves from a branch while reaching for leaves and other food. [5] Reproduction takes place during the dry season of north west Australia, usually between March and August and occasionally giving birth later in that season. The maternal rearing period of the young includes 150 to 200 days within the pouch and another eight months to become independent of the mother; reproductive maturity for the female is reached after two years. [1]

Usually found in denser wooded areas, W. squamicaudata may be seen foraging in open areas. The diet largely includes leaves, seeds, roots and flowering parts of plants, although nuts and insects are also consumed. [1] A study of the species found that up to three quarters of the diet is composed of fruits. [7]

Distribution and habitat

The possum has a limited range and is found in the high rainfall near coastal regions of the north Kimberley between Yampi Sound and Kalumburu, and a smaller population that occurs inland in the east Kimberley at Emma Gorge. [8] [9]

Wyulda squamicaudata is most widely reported across the Artesian Range, where it is moderately common. Populations also inhabit Bigge Island and Boongaree Island. The preferred habitat of this animal is sandstone based woodlands where it can shelter in rock piles and fissures and feed in the trees. [10] They are associated with denser vegetation over rocks and boulders that provide daytime shelter and refuge, often thickets of vines rather than the closed mangrove and open woodlands favoured by Trichosurus arnhemensis . [6] The species is restricted in its range by the complexity of a rocky habitat, providing more dens and refuge from fires in the surrounding landscape. [7]

The species' type location is in the eastern Kimberley, at Violet Valley near Warmun, but most records are of their occurrence are in the north-west of the region. The specimen obtained in 1917 was the only record of the possum in east Kimberley region until 2010, when they were found occurring at Emma Gorge in the Cockburn Range. The eastern and north-western groups may be geographically isolated, but this has not been confirmed by a broad survey of the Kimberley region. [8] It is present in the Charnley River–Artesian Range Wildlife Sanctuary in the Kimberley region of WA. [11]

Wyulda squamicaudata has disappeared at some locations, where they are assumed to have succumbed to frequent and higher intensity fires and predation by feral cats. An outlying occurrence in Broome reported in 1970 is thought have been a displaced individual. [1]

The northern brushtail possum Trichosurus arnhemensis occurs in the same region as this species, but does not appear to share the same habitat. [6]

Conservation

The IUCN Red List assigns a conservation status of near threatened for the species. The population was assessed in 2014 as numbering between 5000 and 10,000 with evidence that it is decreasing. [1]

Related Research Articles

<span class="mw-page-title-main">Phalangeriformes</span> Suborder of arboreal marsupials

Phalangeriformes is a paraphyletic suborder of about 70 species of small to medium-sized arboreal marsupials native to Australia, New Guinea, and Sulawesi. The species are commonly known as possums, gliders, and cuscus. The common name "possum" for various Phalangeriformes species derives from the creatures' resemblance to the opossums of the Americas. However, although opossums are also marsupials, Australasian possums are more closely related to other Australasian marsupials such as kangaroos.

<span class="mw-page-title-main">Common brushtail possum</span> Species of marsupial

The common brushtail possum is a nocturnal, semiarboreal marsupial of the family Phalangeridae, native to Australia and invasive in New Zealand, and the second-largest of the possums.

<span class="mw-page-title-main">Common ringtail possum</span> Species of marsupial

The common ringtail possum is an Australian marsupial.

Possum may refer to:

<span class="mw-page-title-main">Rufous owl</span> Species of owl

The rufous owl, also known as the rufous boobook, is a species of owl in the family Strigidae. It was described in 1846 by John Gould, an English ornithologist. Its common name reflects the rufous-coloured feathers that these owls are covered with in adulthood. While it is uncommon, the species has a wide range, including Australia, Indonesia, and Papua New Guinea.

<span class="mw-page-title-main">Ground cuscus</span> Species of marsupial

The ground cuscus is a marsupial from the order Diprotodontia and belongs within the family Phalangeridae, a diverse family consisting of the other cuscus species and the brushtail possums and the scaly-tailed possum.

<span class="mw-page-title-main">Woodlark cuscus</span> Species of marsupial

The Woodlark cuscus is a species of marsupial in the family Phalangeridae endemic to Papua New Guinea, specifically on Madau and Woodlark Island, a part of the Milne Bay Province of Papua New Guinea. It happens to be the largest mammal living on Woodlark Island but it is also found on the neighboring island of Alcester, 70 kilometers south of Woodlark Island.

<span class="mw-page-title-main">Short-eared possum</span> Species of marsupial

The short-eared possum is a species of marsupial in the family Phalangeridae, endemic to Australia. Found north of Sydney, New South Wales, on Australia’s eastern coast, the species was once classed under the mountain brushtail possum, its closest relative.

<span class="mw-page-title-main">Brushtail possum</span> Genus of marsupials

The brushtail possums are the members of the genus Trichosurus in the Phalangeridae, a family of marsupials. They are native to Australia and some small nearby islands. Unique among marsupials, they have shifted the hypaxial muscles from the epipubic to the pelvis, much like in placental muscles, meaning that their breathing cycle is more similar to the latter than to that of other non-eutherian mammals. In general, they are more terrestrially oriented than other possums, and in some ways might parallel primates.

<span class="mw-page-title-main">Mountain brushtail possum</span> Species of marsupial

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<span class="mw-page-title-main">Phalangeridae</span> Family of marsupials native to Australia, New Guinea, and Eastern Indonesia

The Phalangeridae are a family of mostly nocturnal marsupials native to Australia, New Guinea, and Eastern Indonesia, including the cuscuses, brushtail possums, and their close relatives. Considered a type of possum, most species are arboreal, and they inhabit a wide range of forest habitats from alpine woodland to eucalypt forest and tropical jungle. Many species have been introduced to various non-native habitats by humans for thousands of years.

<span class="mw-page-title-main">Western ringtail possum</span> Species of possum found in Southwest Australia

The western ringtail possum or ngwayir is a species of possum found in a small area of Southwest Australia. They are a cat-sized marsupial with a stocky build, dark greyish-brown fur, pale underparts and a long prehensile tail with a whitish tip. Ngwayir forage at night through the upper canopy of trees, feeding on young leaves, flowers and fruit, especially in groves of the weeping peppermint Agonis flexuosa. Breeding occurs mainly during the winter, the single juvenile emerging from the pouch after about three months. The population has declined by more than 95% since British settlement, due to clearing of habitat, fire and the introduction of the red fox Vulpes vulpes, and is classified as Critically Endangered. The population in most areas has catastrophically declined or become locally extinct, but strongholds remain in the urbanised areas near Busselton and Albany.

<span class="mw-page-title-main">Northern brushtail possum</span> Species of marsupial

The northern brushtail possum is a nocturnal marsupial inhabiting northern Australia. The northern brushtail possum is sometimes considered a species, however more often than not is considered a subspecies of the common brushtail possum.

<span class="mw-page-title-main">Coppery brushtail possum</span> Species of marsupial

The coppery brushtail possum is a species of marsupial possum in the family Phalangeridae. Coppery brushtails are found within the Atherton Tablelands area of Queensland, in northeastern Australia. These mammals inhabit rainforest ecosystems, living within the tree canopy. Though they have a restricted distribution, they are locally common. This population is often considered a subspecies of T. vulpecula.

<span class="mw-page-title-main">Kimberley tropical savanna</span> Terrestrial ecoregion in Western Australia

The Kimberley tropical savanna is a tropical and subtropical grasslands, savannas, and shrublands ecoregion in northwestern Australia, covering portions of Western Australia and the Northern Territory south of the Timor Sea.

Charnley River–Artesian Range Wildlife Sanctuary is a protected area covering about 3,000 square kilometres (1,200 sq mi) in the Kimberley region of Western Australia. It is situated about 205 kilometres (127 mi) east of Derby and 287 kilometres (178 mi) north west of Halls Creek, and is accessed via the Gibb River Road. It is named after the Charnley River that flows through the property.

References

  1. 1 2 3 4 5 Burbidge, A.A.; Woinarski, J. (2016). "Wyulda squamicaudata". IUCN Red List of Threatened Species . 2016: e.T23091A21950421. doi: 10.2305/IUCN.UK.2016-1.RLTS.T23091A21950421.en . Retrieved 18 November 2021.
  2. Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. p. 50. ISBN   0-801-88221-4. OCLC   62265494.
  3. 1 2 3 Alexander, W.B. (1919). "A new species of marsupial of the subfamily Phalangerinae". Journal of the Royal Society of Western Australia. 4: 31–36.
  4. "Wunambal Gaambera Partnership". Bush Heritage Australia. Retrieved 11 November 2020.
  5. 1 2 3 Menkhorst, P.W.; Knight, F. (2011). A field guide to the mammals of Australia (3rd ed.). Melbourne: Oxford University Press. p. 88. ISBN   9780195573954.
  6. 1 2 3 4 Humphreys, W.F.; How, R.A.; Bradley, A.J.; Kemper, C.M.; Kitchener, D.J. (1984). "The biology of Wyulda squamicaudata, Alexander 1919". In Smith, A.P.; Hume, I.D. (eds.). Possums and Gliders. Surrey: Beatty and sons. pp. 162–169.
  7. 1 2 Hohnen, R.; Tuft, K.; Legge, S.; Walters, N.; Johanson, L.; Carver, S.; Radford, I.J.; Johnson, C.N. (2016). "The significance of topographic complexity in habitat selection and persistence of a declining marsupial in the Kimberley region of Western Australia". Australian Journal of Zoology. 64 (3): 198. doi:10.1071/ZO16015. ISSN   0004-959X. S2CID   88822120.
  8. 1 2 Doody, Sean J.; David Rhind C; Christina M. Castellano B & Michael Bass (2012). "Rediscovery of the scaly-tailed possum (Wyulda squamicaudata) in the eastern Kimberley". Australian Mammalogy. 34 (2): 260–262. doi:10.1071/AM11039.
  9. Potter, Sally; Dan Rosauer; J. Sean Doody; Myfanwy J. Webb; Mark D. B. Eldridge (2014). "Persistence of a potentially rare mammalian genus (Wyulda) provides evidence for areas of evolutionary refugia within the Kimberley, Australia". Conservation Genetics. 15 (5): 1085–1094. doi:10.1007/s10592-014-0601-4. S2CID   16476367.
  10. "Action Plan for Australian Marsupials and Monotremes". 1996. Retrieved 2009-03-11.
  11. "Charnley River – Artesian Range: ACE". Australian Wildlife Conservancy . Retrieved 2 January 2021.