Antilopine kangaroo

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Antilopine kangaroo
Macropus antilopinus 1.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Macropodidae
Genus: Osphranter
Species:
O. antilopinus
Binomial name
Osphranter antilopinus
Gould, 1842 [2]
Antilopine Kangaroo.jpg
Antilopine kangaroo range

The antilopine kangaroo (Osphranter antilopinus), [3] also known as the antilopine wallaroo or the antilopine wallaby, is a species of macropod found in northern Australia: in Cape York Peninsula in Queensland, the Top End of the Northern Territory, and the Kimberley region of Western Australia. It is a locally common, gregarious grazer.

Contents

Taxonomy

The description of the species by John Gould was published in 1842, one of four new species of 'kangaroos' presented before the Zoological Society of London in 1841. The type location was given as Port Essington. The author assigned the new species to the genus Osphranter , [2] a taxon later submerged as a subgenus of Macropus , and recognised an affinity with his earlier description of Macropus robustus (known as the common wallaroo or euro). [4] A taxonomic restructuring in 2019, based on genetic analysis, [5] promoted Osphranter back to genus level, redefining the antilopine kangaroo and the red kangaroo, among others, as species within the genus Osphranter. [3]

The common names of the species include antilopine wallaroo, antilopine kangaroo and antilopine wallaby. [4] The specific epithet antilopinus was proposed by Gould for the resemblance of the fur to the African mammals known as antelopes. [2] The descriptive "antilopine" or "antelope" kangaroo is sometimes substituted as the 'antilopine wallaroo', but in behaviour and habitat it is similar to the red, eastern grey and western grey kangaroos. Occupying a similar niche to the large and reddish Osphranter rufus in the woodlands of southern and eastern Australia, it is also referred to locally as the red kangaroo, though it is a different species. [6]

Description

The antilopine kangaroo is a larger species of Osphranter , a genus of kangaroos and wallabies. They share many characteristics with others of the genus, but have longer and more slender limbs like the larger species of the genus. [6] The fur is short, pale at the ventral side and grading to a reddish tan colour over the upper parts of the pelage. Females have similar coloration, although lighter and with greyish fur at the head and shoulders. A patch or stripe of paler coloured fur is seen at the lower part of the head, and a lighter colour at the inside and edge of the ear sharply contrasts with the darker fur colour of outer side. The paws of the front and hind legs are very dark, and contrast the lighter fur of the lower limb. Their tails are thickly covered in fur, a uniform width along its length, and a paler shade of the upper body colour. The bare skin of the rhinarium is black. [7]

Measurements of the head and body combined is up to 1.2 metres (3.9 ft) for males, with a tail to 900 mm (35 in), and no longer than 840 mm (33 in) for females, whose tails are up to 700 mm (28 in). Their standing height, from the crown of the head to the ground, is approximately 1.1 metres (3.6 ft). The female may weigh up to 20 kilograms (44 lb), and males may be over twice this weight at 49 kg. [7]

The male's head shape, like the red kangaroo Osphranter rufus, resembles that of a mule. The antilopine kangaroo is one of a few macropods to display sexual dimorphism, with the male being mostly a reddish colour above, and females being considerably greyer. It is one of the largest macropods, being only slightly smaller than the red kangaroo and the eastern grey kangaroo (Macropus giganteus). [7]

Behaviour

Osphranter antilopinus forms social groupings whose males assert hierarchical dominance over one another. The numbers of each group may be up to 30 individuals, but these may be separate groups assembling as a response to threats from humans or dingoes. The animal may be observed as individuals or with one or two others of the species, although these are assumed to indicate that others are in the immediate area. Seasonal rainy periods induce them to feed during the day or night, but foraging activity is restricted to later parts of the day in the dry seasons. The species is observed with other macropods, often congregating around a waterhole, in the Top End with Osphranter bernardus (the black wallaroo) or more commonly with Osphranter robustus erubescens (the euro) that is also found on open eucalypt woodlands near rocky hills. [6] Communication amongst the individuals includes a hissing sound, given as an alarm, a guttural coughing noise, and a softer cluck uttered by females to their young and when males are soliciting a mate. The species also produces a thumping sound with the foot to alert others to danger. [7]

Breeding may occur at any time of the year, although births tend to be timed to precede the beginning of the north's wet season. [7]

Distribution and habitat

A mounted specimen and the skull of a male, exhibited at the Museo Civico di Storia Naturale di Genova, Genoa, Italy Macropus antilopinus (male) - Museo Civico di Storia Naturale Giacomo Doria - Genoa, Italy - DSC02916.JPG
A mounted specimen and the skull of a male, exhibited at the Museo Civico di Storia Naturale di Genova, Genoa, Italy

The distribution range extends inland from the northern coast of the continent, from the Kimberley region in Western Australia across the Top End and narrowly extending to a wider range at tropical regions at the east of Cape York. The population in Queensland is geographically isolated from others by an environmental barrier below the gulf of Carpentaria, and a second and third clade are weakly distinguishable in the Northern Territory and Kimberley. [8]

The habitat preferred by O. antilopinus is tropical, with perennial grasses providing forage, in vegetation occurring over lower hills and plains. [7] The grasslands of its habitat are found in association with monsoonal eucalypts, as open or regenerating woodlands, or as the dominant vegetation of unwooded plains. They are only found at altitudes less than 500 metres. The species is locally common in parts of the wide range, but these groups occur in a patchy distribution within this area. [1]

Conservation status

This widely distributed and presumably numerous species is listed as least concern by the IUCN, noting that, while the population is assessed as declining, it did not meet the criteria of vulnerable to extinction. The Red List recommends that monitoring of the population be undertaken. In some locations where it was common, local populations of O. antilopinus are known to have declined. Presumed threats to the species include the increase in pastoralist use of the land, with alterations to the fire ecology and hunting being possible factors influencing the species' trajectory. [1]

A large male Antilopine AntilopineWallerooLargeMale.jpg
A large male Antilopine

Related Research Articles

<span class="mw-page-title-main">Kangaroo</span> Marsupial of the family Macropodidae

Kangaroos are marsupials from the family Macropodidae. In common use the term is used to describe the largest species from this family, the red kangaroo, as well as the antilopine kangaroo, eastern grey kangaroo, and western grey kangaroo. Kangaroos are indigenous to Australia and New Guinea. The Australian government estimates that 42.8 million kangaroos lived within the commercial harvest areas of Australia in 2019, down from 53.2 million in 2013.

<span class="mw-page-title-main">Macropodidae</span> Family of marsupial mammals

Macropodidae is a family of marsupials that includes kangaroos, wallabies, tree-kangaroos, wallaroos, pademelons, quokkas, and several other groups. These genera are allied to the suborder Macropodiformes, containing other macropods, and are native to the Australian continent, New Guinea and nearby islands.

<span class="mw-page-title-main">Eastern grey kangaroo</span> Species of kangaroo

The eastern grey kangaroo is a marsupial found in the eastern third of Australia, with a population of several million. It is also known as the great grey kangaroo and the forester kangaroo. Although a big eastern grey male can typically weigh up to 66 kg (146 lb) and have a length of well over 2 m, the scientific name, Macropus giganteus, is misleading: the red kangaroo of the semi-arid inland is larger, weighing up to 90 kg (200 lb).

<span class="mw-page-title-main">Red kangaroo</span> Species of mammal

The red kangaroo is the largest of all kangaroos, the largest terrestrial mammal native to Australia, and the largest extant marsupial. It is found across mainland Australia, except for the more fertile areas, such as southern Western Australia, the eastern and southeastern coasts, and the rainforests along the northern coast.

<span class="mw-page-title-main">Parma wallaby</span> Species of marsupial

The parma wallaby is a small marsupial macropod mammal native to forests and densely-vegetated areas of northeastern New South Wales, Australia, close to the border with Queensland. There is also an introduced population found in and around Rodney District, just north of Auckland, New Zealand. About the size of a stout cat, it lives mainly under thick plant cover, and is only active at night when it emerges to feed on grasses and small plants. It is the smallest of the wallabies and carries its young in a pouch, as with other marsupials. Shy and elusive, it was believed extinct until its rediscovery in the 1960s.

<span class="mw-page-title-main">Western grey kangaroo</span> Species of marsupial

The western grey kangaroo, also referred to as a western grey giant kangaroo, black-faced kangaroo, mallee kangaroo, sooty kangaroo and Kangaroo Island grey kangaroo, is a large and very common kangaroo found across almost the entire southern part of Australia, from just south of Shark Bay through coastal Western Australia and South Australia, into western Victoria, and in the entire Murray–Darling basin in New South Wales and Queensland.

<span class="mw-page-title-main">Wallaroo</span> Category of marsupial

Wallaroo is a common name for several species of moderately large macropods, intermediate in size between the kangaroos and the wallabies. The word "wallaroo" is from the Dharug walaru, and not a portmanteau of the words "kangaroo" and "wallaby", as is commonly assumed.

<span class="mw-page-title-main">Tammar wallaby</span> A small macropod native to South and Western Australia

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The western brush wallaby, also known as the black-gloved wallaby, is a species of wallaby found in the southwestern coastal region of Western Australia. The wallaby's main threat is predation by the introduced red fox. The IUCN lists the western brush wallaby as Least Concern, as it remains fairly widespread and the population is believed to be stable or increasing, as a result of red fox control programs.

<span class="mw-page-title-main">Black wallaroo</span> Species of marsupial

The black wallaroo, also known as Woodward's wallaroo, is a species of macropod restricted to a small, mountainous area in Arnhem Land, Northern Territory, Australia, between South Alligator River and Nabarlek. It classified as near threatened, mostly due to its limited distribution. A large proportion of the range is protected by Kakadu National Park.

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

The common wallaroo, also known as the euro, hill wallaroo, or simply wallaroo, is a species of macropod. The word euro is particularly applied to one subspecies.

<span class="mw-page-title-main">Northern nail-tail wallaby</span> Species of marsupial

The northern or sandy nail-tail wallaby is a species of macropod found across northern Australia on arid and sparsely wooded plains. The largest species of the genus Onychogalea, it is a solitary and nocturnal herbivorous browser that selects its food from a wide variety of grasses and succulent plant material. Distinguished by a slender and long-limbed form that resembles the typical and well known kangaroos, although their standing height is shorter, around half of one metre, and their weight is less than nine kilograms. As with some medium to large kangaroo species, such as Osphranter rufus, they have an unusual pentapedal motion at slow speeds by stiffening the tail for a fifth limb. When fleeing a disturbance, they hop rapidly with the tail curled back and repeatedly utter the sound "wuluhwuluh". Their exceptionally long tail has a broad fingernail-like protuberance beneath a dark crest of hair at its end, a peculiarity of the genus that is much broader than the other species. The name unguifera, meaning claw, is a reference to this extraordinary attribute, the purpose of which is unknown.

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

Nabarleks, are a tiny species of macropod found in northern Australia. They are a shy and nocturnal animal that resides in rocky hollows and forages in the surrounding area. Their diet is grasses, sedges, and ferns found in and around their scrub covered refuges. They are distinguished by a reddish tinge to the mostly grey fur and a distinct stripe at the cheek. They move with great speed and agility when observed, with a forward leaning posture and a bushy tail that arches over the back.

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<i>Osphranter</i> Genus of marsupials

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References

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  2. 1 2 3 Gould, J. (1842). "Descriptions of four New Species of Kangaroos". Proceedings of the Zoological Society of London. 1841: 80.
  3. 1 2 "Names List for MACROPODIDAE, Australian Faunal Directory". Australian Biological Resources Study, Australian Department of the Environment and Energy. 13 February 2020. Retrieved 1 March 2020.
  4. 1 2 Groves, C. P. (2005). "Order Diprotodontia". In Wilson, D. E.; Reeder, D. M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 63–64. ISBN   978-0-8018-8221-0. OCLC   62265494.
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  6. 1 2 3 Calaby, J.H. (1983). "Antilopine Wallaroo". In Strahan, R. (ed.). Complete book of Australian mammals. The national photographic index of Australian wildlife. London: Angus & Robertson. p. 252. ISBN   0207144540.
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  8. Wadley, J.J.; Fordham, D.A.; Thomson, V.A.; Ritchie, E.G.; Austin, J.J. (November 2016). "Phylogeography of the antilopine wallaroo (Macropus antilopinus) across tropical northern Australia". Ecology and Evolution. 6 (22): 8050–8061. doi:10.1002/ece3.2381. PMC   5108257 . PMID   27878077.