Potoroidae

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Potoroidae [1]
Temporal range: Late Oligocene–recent
Bettongia penicillata.jpg
Woylie (Bettongia penicillata)
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Suborder: Macropodiformes
Family: Potoroidae
Gray, 1821
Type genus
Potorous
Desmarest, 1804

Potoroidae is a family of marsupials, small Australian animals known as bettongs, potoroos, and rat-kangaroos. All are rabbit-sized, brown, jumping marsupials and resemble a large rodent or a very small wallaby.

Contents

Taxonomy

The potoroids are smaller relatives of the kangaroos and wallabies, and may be ancestral to that group. In particular, the teeth show a simpler pattern than in the kangaroo family, with longer upper incisors, larger canines, and four cusps on the molars. [2] However, both groups possess a wide diastema between the incisors and the cheek teeth, and the potoroids have a similar dental formula to their larger relatives:

Dentition
3.0-1.2.4
1.0.2.4

In most respects, however, the potoroids are similar to small wallabies. Their hind feet are elongated, and they move by hopping, although the adaptations are not as extreme as they are in true wallabies, and, like rabbits, they often use their fore limbs to move about at slower speeds.

The potoroids are, like nearly all diprotodonts, herbivorous. However, while they take a wide variety of plant foods, most have a particular taste for the fruiting bodies of fungi, and often depend on fungi to see them through periods when little else is available to eat in the dry Australian bush. One example of a potoroo that sustains itself on fungi is the long-footed potoroo. This animal's diet is almost entirely made up of fungal spores. This limits its habitat range as it needs to live in a moist environment, with dense cover to reduce predation from introduced species such as foxes and feral cats.

Ecology

The once populous species of this family played a role in the engineering of soil, dominating the sub-storey of vegetation, and regarded as crucial to the maintenance of the friable soils that they created by digging for fungi and other subsoil foods. [3]

Status

Four modern species of bettongs are extant and two have become extinct. Bettongs were endangered because settlers took much of their habitat, and the red foxes they introduced to the continent also killed many of them. At one time, several species lived all over Australia. Today, the Tasmanian bettong lives only in the eastern half of Tasmania, and the northern bettong lives only in three isolated populations in northern Queensland.

The potoroines have exemplified the impact of ecological changes since colonisation of Australia. Most species have become extinct within their former distribution range, and are either totally extinct or conserved only by preservation in isolated habitat and re-population programs. [3]

Classification

Gilbert's potoroo Potorous gilberti - Gould.jpg
Gilbert's potoroo
Eastern bettong Bettongia gaimardi.jpg
Eastern bettong

A basal branch of the macropods, [3] the three extant genera of the Potoroidae contain eight species. [1] [4]

The arrangements of the related taxa have seen an arrangement of the subfamilies within Potoroidae, although an earlier classification within the family Macropodidae has also been supported by genetic studies.

A conservative arrangement of modern and fossil taxa may be summarised as: [5]

Related Research Articles

Diprotodontia Order of marsupial mammals

Diprotodontia is the largest extant order of marsupials, with about 155 species, including the kangaroos, wallabies, possums, koala, wombats, and many others. Extinct diprotodonts include the hippopotamus-sized Diprotodon, and Thylacoleo, the so-called "marsupial lion".

Macropodidae Family of mammals (marsupials)

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

Phalangerida Suborder of marsupials

Phalangerida is one of the two former suborders of the large marsupial order Diprotodontia. This large and diverse suborder included kangaroos, wallabies, quokkas, possums, gliding possum-like marsupials and others. The much smaller suborder Vombatiformes encompasses only the koalas and wombats. This suborder is no longer considered to accurately describe the diversity in Diprotodontia.

Woylie Species of marsupial

The woylie or brush-tailed bettong is an extremely rare, small marsupial, belonging to the genus Bettongia, that is endemic to Australia. There are two subspecies: B. p. ogilbyi, and the now extinct B. p. penicillata.

Eastern bettong Species of marsupial

The eastern bettong, also known as the Balbo, southern bettong and Tasmanian bettong, is a bettong whose natural range includes southeastern Australia and eastern Tasmania.

Musky rat-kangaroo Species of marsupial

The musky rat-kangaroo is a small marsupial found only in the rainforests of northeastern Australia. First described in the later 19th century, the only other species are known from fossil specimens. They are similar in appearance to potoroos and bettongs, but are not as closely related. Their omnivorous diet is known to include materials such as fruit and fungi, as well as small animals such as insects and other invertebrates. The local Aboriginal name for the species is durrgim yuri.

Northern bettong Species of marsupial

The northern bettong is a small potoroid marsupial which is restricted to some areas of mixed open Eucalyptus woodlands and Allocasuarina forests bordering rainforests in far northeastern Queensland, Australia. They are known as "rat kangaroos" and move about in a slow hopping manner. There are five different species in Australia of this particular animal. It is about the size of a rabbit with a large tail dragging behind.

Potoroo Genus of marsupials

Potoroo is a common name for species of Potorous, a genus of smaller marsupials. They are allied to the Macropodiformes, the suborder of kangaroo, wallaby, and other rat-kangaroo genera. All three extant species are threatened by ecological changes since the colonisation of Australia, especially the long-footed potoroo Potorous longipes (endangered) and P. gilbertii. The broad-faced potoroo P. platyops disappeared after its first description in the 19th century. The main threats are predation by introduced species and habitat loss.

Macropodiformes Suborder of marsupials

The Macropodiformes, also known as macropods, are one of the three suborders of the large marsupial order Diprotodontia. They may in fact be nested within one of the suborders, Phalangeriformes. Kangaroos, wallabies and allies, bettongs, potoroos and rat kangaroos are all members of this suborder.

Boodie Species of marsupial

The boodie, also known as the burrowing bettong, or Lesueur's rat-kangaroo, is a small marsupial. Its population is an example of the effects of introduced animals on Australian fauna and ecosystems. Once the most common macropodiform mammal on the whole continent, the boodie now only lives on off-lying islands and in a newly introduced population on the mainland at Shark Bay. This animal, first collected during an 1817 French expedition of the west coast, was named after Charles Lesueur, an artist and naturalist who accompanied a previous French expedition.

Rufous rat-kangaroo Species of marsupial

The rufous rat-kangaroo, more commonly known as the rufous bettong, is a small marsupial species of the family Potoroidae found in Australia. It is not classified as threatened. The rufous bettong is about the size of a full-grown rabbit.

Bettong Genus of marsupials

Bettongs, species of the genus Bettongia, are potoroine marsupials once common in Australia. They are important ecological engineers displaced during the colonisation of the continent, and are vulnerable to threatening factors such as altered fire regimes, land clearing, pastoralism and introduced predatory species such as the fox and cat.

The Nullarbor dwarf bettong, Bettongia pusilla, was a potoroine marsupial that occurred in Australia. The animal is only known from skeletons found in caves of the Nullarbor Plain and is now classified as recently extinct.

The Macropodidae are an extant family of marsupial with the distinction of the ability to move bipedally on the hind legs, sometimes by jumping, as well as quadrupedally. They are herbivores, but some fossil genera like Ekaltadeta are hypothesised to have been carnivores. The taxonomic affiliations within the family and with other groups of marsupials is still in flux.

Bulungamayinae is a subfamily that allies fossil species of marsupials, showing close morphological features found in the modern potoroines, the bettongs and potoroos of Australia.

Palaeopotorous priscus is a fossil species of a diprotodont marsupial, known from specimens obtained in central Australia. The animal was similar to the modern species of the family Potoroidae, the potoroos and bettongs.

Bettongia moyesi is a fossil species of potoroid marsupial.

References

  1. 1 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. pp. 56–58. ISBN   0-801-88221-4. OCLC   62265494.
  2. Poole, William E. (1984). Macdonald, D. (ed.). The Encyclopedia of Mammals . New York: Facts on File. pp.  862–871. ISBN   0-87196-871-1.
  3. 1 2 3 Prideaux, Gavin J.; Baynes, Alexander; Bunce, Michael; Aplin, Ken P.; Haouchar, Dalal; McDowell, Matthew C. (25 April 2015). "Morphological and molecular evidence supports specific recognition of the recently extinct Bettongia anhydra (Marsupialia: Macropodidae)". Journal of Mammalogy. 96 (2): 287–296. doi: 10.1093/jmammal/gyv006 . ISSN   0022-2372.
  4. Haaramo, M. (15 November 2005). "Mikko's Phylogeny Archive: Potoroidae - rat-kenguroos". Archived from the original on 11 June 2007. Retrieved 2008-01-27.
  5. Claridge, A.W.; Seebeck, J.H.; Rose, R. (2007). Bettongs, potoroos, and the musky rat-kangaroo. Collingwood, Victoria: CSIRO Pub. ISBN   9780643093416.