Northern marsupial mole

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Northern marsupial mole
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Notoryctemorphia
Family: Notoryctidae
Genus: Notoryctes
Species:
N. caurinus
Binomial name
Notoryctes caurinus
Thomas, 1920 [2]
Northern Marsupial Mole area.png
distribution range of northwest species N. caurinus

The northern marsupial mole or kakarratul (Notoryctes caurinus) is a marsupial in the family Notoryctidae, an endemic animal of arid regions of Central Australia. It lives in the loose sand of dunes and river plains in the desert, spending nearly its entire life beneath ground. The facial features are reduced or absent, their small and strong body, weighing little more the 30 grams (1 ounce), is extremely specialised to moving through sand in search of prey. The species is elusive and it is one of the most poorly understood mammals of Australia.

Contents

Taxonomy

A description of the species was published by Oldfield Thomas in 1920. [2] One of two extant species of the genus Notoryctes , following recognition of its separation from Notoryctes typhlops in 1988. [3] The specimen described by Thomas was collected in 1910 by a postal official at Wollal, at Ninety Mile Beach in north-western Australia, and this was conveyed to the Western Australian Museum. Thomas distinguished the new species from the southern N. typhlops, described in 1891 by E. C. Stirling, as smaller, particularly its claws and muzzle/nose, but with larger auditory bulla. He also described them as differing in dentition to the southern species, especially in their lower jaw. [2]

The northern marsupial mole is also called the northwestern marsupial mole. [3] Described as 'unimaginative', these common names were replaced with that derived from indigenous languages of the region in 1996, which has been widely accepted since. [4]

Description

The kakarratul and itjaritjari, species Notoryctes typhlops, are superficially indistinguishable and unmistakable for any other animal. The dense pelage is short, smooth and finely haired, this is a uniform and pale yellow-pink colour. The length of the head and body combined is 120 to 160 mm and the stubby, leathery tail is 20 to 25 mm. The weight range is from 40 to 70 grams. The vestigial eyes are a non-functioning subcutaneous lens. and a leathery covering at the pointed snout protects the nostrils. No external ear is present, the opening for the reduced structure is covered in a dense layer of hairs. [4] A fossorial animal, the highly specialised form of the body is tubular, its head narrowing in view to a conical shape and the limbs are short and well suited to digging. The two claws of the third and fourth front toe are enlarged and able to shovel the sand ahead of themselves. [5] A pouch used in rearing young, a feature common to marsupials and as is usual for subterranean species, faces away from the direction of travel to avoid sand entering it. [4]

The anatomy of N. caurinus has been examined with CT scans, showing the skeletal tomography, and MRI that give some details of soft tissue structures, the 2003 study being the first since the details given by Thomas in 1920. The vertebrae at the hind part of kakarratul are completely fused, a unique characteristic amongst the marsupials, and the spinal column is greatly strengthened; the side view of the spine shows a flattened profile that is also advantageous to its fossorial habits. Results of soft tissue examination showed large amounts of subcutaneous fat at the shoulders and pelvic regions. [6] In an example of convergent evolution, the unusual metabolism of the species was compared to the physiology of a placental mammal of a golden mole found in Africa, similar in form and ecological factors, the subspecies Eremitalpa granti namibensis . [7]

Distribution and habitat

The species is distributed over an area of northwest Australia, at aeolian dunes and other soft sand terrain of the Australian interior. The records include the Little Sandy and Great Sandy Deserts, and at northern areas of the Gibson Desert. [1] The kakarratul is not able to easily traverse hardened sands or other terrain. [4] It is thought both of these notoryctid species, the kakarratul and itjaritjari, may be sympatric where their distribution range overlaps in the south and east. [5] The population structure within the range is poorly examined. There are around three hundred specimens available in collections of museums and elsewhere, although information on the range is limited to the two thirds with details of the collection site. [4]

The habitat is at the series of sand dunes arising from the adjacent sandy plains, the populations seem to be restricted to these formations; they are noted as absent when dunes are poorly connected or become isolated. [1] The vegetation is typical of the central regions, acacia and other hardy shrubs or small trees, and this species is also often associated with habitat around Triodia (spinifex) hummocks. [4]

Ecology

Very little is known of the habits of two species of Notoryctes, they are presumed to live a solitary existence. It is thought that they only emerge from the sand in wet weather. [5] When moving on the surface of the ground, their motion is sinewy and the belly leaves a slightly winding trail; the marks of the appendages leave light impressions on the sand at the side of this furrow and appear more reptilian than mammalian. [8] They enter the sandy soil at a shallow depth, but may tunnel deeply. A specimen was lost immediately after being placed on the ground, despite several people digging over the area to recover the animal. [8]

Their natural habitat is the hot and arid north-western deserts of country. [1] The diet consists of insect pupae and larvae. [9] The species eats the larvae and pupae of ants, beetles and other insects. It catches and eats them underground and therefore rarely comes to the surface. It is commonly preyed upon by the introduced red fox and feral cats, and in the scats of the dingo as well as some birds of prey, snakes and goannas. [1] Large numbers of specimens were collected in the early twentieth century, and informal reports of a fur trade using the pelt of the animal are noted. [4]

The effect on the ecology is largely unknown, but it is presumed to affect the populations of the small invertebrates in its diet. [4] The impact of the subterranean activity on soil turnover is also presumed to be significant, the species does not build burrows as the soil it lives in is too soft and they instead 'swim' in the soil in a reptilian fashion. [1] The tunnelling of the species while foraging causes the sand to shift as it falls behind them, the course of these has been measured at sites as moving in a criss-cross path of 30 to 60 kilometres per hectare that displaces 40 to 80 m3 of sand. [4]

As no member of this species has been successfully held in captivity for an extended period of time, very little is known about the breeding and reproduction habits of the N. caurinus. However they have been recorded as having one or two offspring at a time. [1] An early attempt to maintain a live specimen had it placed in a container of sand and fed on pieces of bread, but this died within a day. [8] The behaviour and whereabouts of both species of Notoryctes were well known to the inhabitants who lived in the same regions, often incorporated into myth and referred to by a variety of names. Since the earliest published description, local peoples have provided information and have been involved in their collection for curious visitors. [4]

The genus Notoryctes closely resembles a placental mammal found in Africa, known as the golden mole, and this is thought to be an example of convergent, rather than parallel, evolution. The features and tubular form of the body somewhat resemble the family Talpidae, referred to as moles, an animal that excavates tunnels rather than swimming through sand.

Conservation

The IUCN redlist notes this species as Least Concern, the population evaluated as being widespread and assumed to be stable. [1] The conservation status in Western Australia is near threatened, and noted in the sensitive species list as rare (P4).

Related Research Articles

<span class="mw-page-title-main">Mole (animal)</span> Small subterranean mammal

Moles are small mammals adapted to a subterranean lifestyle. They have cylindrical bodies, velvety fur, very small, inconspicuous eyes and ears, reduced hindlimbs, and short, powerful forelimbs with large paws adapted for digging.

<span class="mw-page-title-main">Marsupial mole</span> Genus of marsupials

Marsupial moles, the Notoryctidae family, are two species of highly specialized marsupial mammals that are found in the Australian interior. They are small fossorial marsupials that anatomically converge on fossorial placental mammals, such as extant golden moles (Chrysochloridae) and extinct epoicotheres (Pholidota). The species are:

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

The numbat, also known as the noombat or walpurti, is an insectivorous marsupial. It is diurnal and its diet consists almost exclusively of termites.

<span class="mw-page-title-main">Golden mole</span> Monotypic family of mammals

Golden moles are small insectivorous burrowing mammals endemic to Sub-Saharan Africa. They comprise the family Chrysochloridae and as such they are taxonomically distinct from the true moles, family Talpidae, and other mole-like families, all of which, to various degrees, they resemble as a result of evolutionary convergence. There are 21 species. Some are relatively common, whereas others are rare and endangered.

<span class="mw-page-title-main">Broad-faced potoroo</span> Extinct species of marsupial

The broad-faced potoroo is an extinct potoroid marsupial that was found in southwestern Australia. The first specimen was collected in 1839, and described by John Gould in 1844. Only a small number of specimens have been collected since. The last live capture was in 1875. Subfossil remains indicate that it had an extensive distribution around the semiarid coastal districts of Southwest Australia.

<span class="mw-page-title-main">Notoryctidae</span> Family of marsupials

Notoryctidae are a family of marsupials comprising the marsupial moles and their fossil relatives. It is the only family in the order Notoryctemorphia.

<span class="mw-page-title-main">Talpidae</span> Family of small insectivorous mammals

The family Talpidae includes the moles who are small insectivorous mammals of the order Eulipotyphla. Talpids are all digging animals to various degrees: moles are completely subterranean animals; shrew moles and shrew-like moles somewhat less so; and desmans, while basically aquatic, excavate dry sleeping chambers; whilst the quite unique star-nosed mole is equally adept in the water and underground. Talpids are found across the Northern Hemisphere of Eurasia and North America, and range as far south as the montane regions of tropical Southeast Asia.

<span class="mw-page-title-main">Cloaca</span> Posterior opening in zoology

A cloaca, pl.: cloacae, is the rear orifice that serves as the only opening for the digestive, reproductive, and urinary tracts of many vertebrate animals. All amphibians, reptiles, birds, and a few mammals, have this orifice, from which they excrete both urine and feces; this is in contrast to most placental mammals, which have two or three separate orifices for evacuation and reproduction. Excretory openings with analogous purpose in some invertebrates are also sometimes called cloacae. Mating through the cloaca is called cloacal copulation and cloacal kissing.

<span class="mw-page-title-main">Australidelphia</span> Superorder of marsupials

Australidelphia is the superorder that contains roughly three-quarters of all marsupials, including all those native to Australasia and a single species — the monito del monte — from South America. All other American marsupials are members of the Ameridelphia. Analysis of retrotransposon insertion sites in the nuclear DNA of a variety of marsupials has shown that the South American monito del monte's lineage is the most basal of the superorder.

<i>Phascolarctos</i> Genus of marsupials

Phascolarctos is a genus of marsupials with one extant species, the koala Phascolarctos cinereus, an iconic animal of Australia. Several extinct species of the genus are known from fossil material, these were also large tree dwellers that browsed on Eucalyptus leaves.

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

The kowari, also known by its Diyari name kariri, is a small carnivorous marsupial native to the gibber deserts of central Australia. It is the sole member of the genus Dasyuroides.

<span class="mw-page-title-main">Lesser bilby</span> Extinct species of marsupial

The lesser bilby, also known as the yallara, the lesser rabbit-eared bandicoot or the white-tailed rabbit-eared bandicoot, was a rabbit-like marsupial. The species was first described by Oldfield Thomas as Peregale leucura in 1887 from a single specimen from a collection of mammals of the British Museum. Reaching the size of a young rabbit, this species lived in the deserts of Central Australia. Since the 1950s–1960s, it has been believed to be extinct.

<span class="mw-page-title-main">Little red kaluta</span> Species of marsupial

The little red kaluta is a small, reddish-brown, shrew-like mammal native to dry grasslands of northwest Australia. It is active at night, feeding on insects and other small animals. The kaluta is a marsupial and is the only member of its genus, Dasykaluta. Individuals are around 10 cm (3.9 in) long and weigh from 20 to 40 g. They live for about four years in captivity. Other common names include little red antechinus, russet antechinus and spinifex antechinus.

<i>Chaeropus</i> Extinct genus of marsupials

Chaeropus, known as the pig-footed bandicoots, is a genus of small marsupials that became extinct during the 20th century. They were the only members of the family Chaeropodidae in order Peramelemorphia, with unusually thin legs, yet were able to move rapidly. Two recognised species inhabited dense vegetation on the arid and semiarid plains of Australia. The genus' distribution range was later reduced to an inland desert region, where it was last recorded in the 1950s; it is now presumed extinct.

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

The kultarr is a small insectivorous nocturnal marsupial inhabiting the arid interior of Australia. Preferred habitat includes stony deserts, shrubland, woodland, grassland and open plains. The kultarr has a range of adaptations to help cope with Australia's harsh arid environment including torpor similar to hibernation that helps conserve energy. The species has declined across its former range since European settlement due to changes in land management practices and introduced predators.

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

The southern ningaui is a tiny marsupial carnivore belonging to the Dasyuridae family. Similar in appearance to Ningaui ridei, found throughout central Australia, this species occurs in spinifex on semi-arid sandplains across the southern coast of the continent. The fur is a tawny or greyish olive colour, light grey below, and distinguished by shades of cinnamon. The southern ningaui prefers smaller prey, including insects and spiders, but capable of killing and consuming larger animals such as cockroaches and skinks. Their narrow muzzle is used with quick and fierce bites about the head to despatch their meal. The species was first described in 1983, and placed within the genus Ningaui.

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

The southern marsupial mole, also known as the itjaritjari or itjari-itjari, is a mole-like marsupial found in the western central deserts of Australia. It is extremely adapted to a burrowing way of life. It has large, shovel-like forepaws and silky fur, which helps it move easily. It also lacks complete eyes as it has little need for them. It feeds on earthworms and larvae.

Naraboryctes philcreaseri is a fossil species of marsupial found at early Miocene deposits of Boodjamulla National Park of Riversleigh area, northwestern Queensland, Australia.

Queen Victoria Spring Nature Reserve is a protected area managed by the Department of Parks and Wildlife and is located approximately 200 km (124 mi) east of Kalgoorlie in the Great Victoria Desert in the Goldfields-Esperance region of Western Australia.

References

  1. 1 2 3 4 5 6 7 8 Burbidge, A.A.; Zichy-Woinarski, J. (2016). "Notoryctes caurinus". IUCN Red List of Threatened Species . 2016: e.T14878A21964848. doi: 10.2305/IUCN.UK.2016-1.RLTS.T14878A21964848.en . Retrieved 20 November 2021.
  2. 1 2 3 Thomas, Oldfield (1920). "XI.—Notoryctes in North-west Australia". Annals and Magazine of Natural History. 6 (31): 111–113. doi:10.1080/00222932008632418. ISSN   0374-5481.
  3. 1 2 Groves, C.P. (2005). "Order Notoryctemorphia". In Wilson, D.E.; Reeder, D.M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. p. 22. ISBN   978-0-8018-8221-0. OCLC   62265494.
  4. 1 2 3 4 5 6 7 8 9 10 Benshemesh, J. (2004). Recovery Plan for Marsupial Moles Notoryctes typhlops and N. caurinus. 2005-2010 (PDF).
  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. 148. ISBN   9780195573954.
  6. Warburton, N.; Wood, C.; Lloyd, C.; Song, S.; Withers, P. (2003). "The 3-dimensional anatomy of the north-western marsupial mole (Notoryctes caurinus Thomas 1920) using computed tomography, x-ray and magnetic resonance imaging". Records of the Western Australian Museum. 22 (1): 1–7. doi: 10.18195/issn.0312-3162.22(1).2003.001-007 .
  7. Withers, P.C.; Thompson, G.G.; Seymour, R.S. (2000). "Metabolic physiology of the north-western marsupial mole, Notoryctes caurinus (Marsupialia : Notoryctidae)". Australian Journal of Zoology. 48 (3): 241. doi:10.1071/ZO99073.
  8. 1 2 3 Van Dyke, S. and Strahan, R. (eds.) (2008) The Mammals of Australia, Third Edition, New Holland / Queensland Museum, Brisbane ISBN   978-1-877069-25-3
  9. "Northern Marsupial Mole". Archived from the original on 2013-06-26. Retrieved 2008-02-09.

Further reading