関: kangaroo、Macropus、wallaby

WordNet

kangaroos; wallabies (同)family Macropodidae
any of several herbivorous leaping marsupials of Australia and New Guinea having large powerful hind legs and a long thick tail
any of various small or medium-sized kangaroos; often brightly colored (同)brush kangaroo
type genus of the family Macropodidae: typical kangaroos and wallabies (同)genus Macropus

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カンガルー
ワラビー(小型のカンガルー)

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/11/29 14:05:04」(JST)

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Macropods are marsupials belonging to the family Macropodidae, the kangaroo family, which includes kangaroos, wallabies, tree-kangaroos, pademelons, quokkas, and several others. Macropods are native to the Australian continent (the mainland, Tasmania, New Guinea and nearby islands).^[2] Before European settlement of Australia, about 65 species of macropods existed. Six species have since become extinct and a further eleven have been greatly reduced in numbers. Other species (e.g. Simosthenurus, Propleopus, Macropus titan) became extinct after the Australian Aborigines arrived and before the Europeans arrived.

Physical description

Bennett's wallaby skull

Although omnivorous kangaroos lived in the past, modern macropods are herbivorous. Some are browsers, but most are grazers and are equipped with appropriately specialised teeth for cropping and grinding up fibrous plants, in particular grasses and sedges. In general, macropods have a broad, straight row of cutting teeth at the front of the mouth, no canine teeth, and a gap before the molars. The molars are large and, unusually, do not appear all at once but a pair at a time at the back of the mouth as the animal ages, eventually becoming worn down by the tough, abrasive grasses and falling out. Most species have four molars and, when the last pair is too worn to be of use, the animals starve to death.^{[citation needed]} The dental formula for macropods is 3.0-1.2.41.0.2.4

Like the eutherian ruminants of the Northern Hemisphere (sheep, cattle, and so on), macropods have specialised digestive systems that use a high concentration of bacteria, protozoans, and fungi in the first chamber of a complex stomach to digest plant material. The details of organisation are quite different, but the end result is somewhat similar.

The particular structure-function relationship of the Macropodidae gut and the gut microbiota allows the degradation of lignocellulosic material with a relatively low emission of methane relative to other ruminants. These low emissions are partly explained by the anatomical differences between the macropodid digestive system and that of ruminants, resulting in shorter retention times of particulate digesta within the foregut. This fact might prevent the establishment of methanogenic archaea, which has been found in low levels in tammar wallabies (Macropus eugenii) and eastern grey kangaroo (M. giganteus). Metagenomic analysis revealed that the foregut of tammar wallabies mainly contains bacteria belonging to the phyla Firmicutes, Bacteroides, and Proteobacteria. Among proteobacteria populations of the Succinivibrionaceae family are overrepresented and may contribute to low methane emissions.^[3]

Macropods vary in size considerably, but most have very large hind legs and long, powerfully muscled tails. The term macropod comes from the Greek for "large foot" and is appropriate: most have very long, narrow hind feet with a distinctive arrangement of toes. The fourth toe is very large and strong, the fifth toe moderately so; the second and third are fused; and the first toe is usually missing. Their short front legs have five separate digits. Some macropods have seven carpal bones instead of the usual eight in mammals [1]. All have relatively small heads and most have large ears, except for tree-kangaroos, which must move quickly between closely spaced branches. The young are born very small and the pouch opens forward.

The unusual development of the hind legs is optimised for economical long-distance travel at fairly high speed. The greatly elongated feet provide enormous leverage for the strong legs, but the famous kangaroo hop has more: kangaroos and wallabies have a unique ability to store elastic strain energy in their tendons. In consequence, most of the energy required for each hop is provided "free" by the spring action of the tendons (rather than by muscular effort). The main limitation on a macropod's ability to leap is not the strength of the muscles in the hindquarters, it is the ability of the joints and tendons to withstand the strain of hopping.

Quokka with young

In addition, the hopping action is linked to breathing. As the feet leave the ground, air is expelled from the lungs by what amounts to an internal piston; bringing the feet forward ready for landing fills the lungs again, providing further energy efficiency. Studies of kangaroos and wallabies have demonstrated that, beyond the minimum energy expenditure required to hop at all, increased speed requires very little extra effort (much less than the same speed increase in, say, a horse, a dog, or a human), and also that little extra energy is required to carry extra weight — something that is of obvious importance to females carrying large pouch young.^{[citation needed]}

The ability of larger macropods to survive on poor-quality, low-energy feed, and to travel long distances at high speed without great energy expenditure (to reach fresh food supplies or waterholes, and to escape predators) has been crucial to their evolutionary success on a continent that, because of poor soil fertility and low, unpredictable average rainfall, offers only very limited primary plant productivity.

Gestation in macropods lasts about a month, being slightly longer in the largest species. Typically, only a single young is born, weighing less than 1 g (0.035 oz) at birth. They soon attach themselves to one of four teats inside the mother's pouch. The young leave the pouch after five to 11 months, and are weaned after a further two to six months. Macropods reach sexual maturity at one to three years of age, depending on species.^[4]

Fossil record

Procoptodon goliah

Simosthenurus occidentalis

Sthenurus strilingi

The evolutionary ancestors of marsupials split from placental mammals during the Jurassic period about 160 million years ago (Mya).^[5] The earliest known fossil macropod dates back about 11.61 to 28.4 Mya, either in the Miocene or Late Oligocene, and was uncovered in South Australia. Unfortunately, the fossil could not be identified any further than the family. A Queensland fossil of a species similar to Hadronomas has been dated at around 5.33 to 11.61 Mya, falling in the Late Miocene or Early Pliocene. The earliest completely identifiable fossils are from around 5.33 Mya.^[6]

Classification

Tree-kangaroos have smaller ears for easier maneuvering between tree branches, and a much longer tail.

Red kangaroo showing pentapedal locomotion while grazing: The forelimbs and tail take the animal's weight while the hind legs are brought forward.

A pademelon has typical macropod legs, although they are obscured by fur in this image.

A pademelon eating a slice of sweet potato: Although usually grazing directly from the ground with their mouth, macropods may also use their front paws to assist in grazing.

A "forester kangaroo" hopping over a puddle.

The two living subfamilies in the family Macropodidae are the Lagostrophinae, represented by a single species, the banded hare-wallaby, and the remainder, about 60 species, which make up the subfamily Macropodinae.

Macropodidae^[1]^[7]
- - Genus †Watutia
  - Genus †Dorcopsoides
  - Genus †Kurrabi
- Subfamily Lagostrophinae^[8]
  - Genus Lagostrophus
    - Banded hare-wallaby, Lagostrophus fasciatus
  - Genus †Protemnodon
  - Genus †Tropsodon
- Subfamily Sthenurinae
  - Genus †Hadronomas
  - Tribe †Sthenurini
    - Genus †Sthenurus
    - Genus †Eosthenurus
  - Genus †Metasthenurus
  - Tribe †Simosthenurini
    - Genus †Archaeosimos
    - Genus †Simosthenurus
    - Genus †Procoptodon
- Subfamily Macropodinae
  - Genus †Prionotemnus
  - Genus †Congruus
  - Genus †Baringa
  - Genus †Bohra
  - Genus †Synaptodon
  - Genus †Fissuridon
  - Genus †Silvaroo
  - Genus Dendrolagus: tree-kangaroos
    - Grizzled tree-kangaroo, Dendrolagus inustus
    - Lumholtz's tree-kangaroo, Dendrolagus lumholtzi
    - Bennett's tree-kangaroo, Dendrolagus bennettianus
    - Ursine tree-kangaroo, Dendrolagus ursinus
    - Matschie's tree-kangaroo, Dendrolagus matschiei
    - Doria's tree-kangaroo, Dendrolagus dorianus
    - Goodfellow's tree-kangaroo, Dendrolagus goodfellowi
    - Lowlands tree-kangaroo, Dendrolagus spadix
    - Golden-mantled tree-kangaroo, Dendrolagus pulcherrimus
    - Seri's tree-kangaroo, Dendrolagus stellarum
    - Dingiso, Dendrolagus mbaiso
    - Tenkile, Dendrolagus scottae
  - Genus Dorcopsis
    - Brown dorcopsis, Dorcopsis muelleri
    - White-striped dorcopsis, Dorcopsis hageni
    - Black dorcopsis, Dorcopsis atrata
    - Gray dorcopsis, Dorcopsis luctuosa
  - Genus Dorcopsulus
    - Small dorcopsis, Dorcopsulus vanheurni
    - Macleay's dorcopsis, Dorcopsulus macleayi
  - Genus Lagorchestes
    - †Lake Mackay hare-wallaby, †Lagorchestes asomatus
    - Spectacled hare-wallaby, Lagorchestes conspicillatus
    - Rufous hare-wallaby, Lagorchestes hirsutus
    - †Eastern hare-wallaby, †Lagorchestes leporides
  - Genus Macropus
    - Subgenus Notamacropus
      - Agile wallaby, Macropus agilis
      - Black-striped wallaby, Macropus dorsalis
      - Tammar wallaby, Macropus eugenii
      - †Toolache wallaby, †Macropus greyii
      - Western brush wallaby, Macropus irma
      - Parma wallaby, Macropus parma (rediscovered, thought extinct for 100 years)
      - Pretty-faced wallaby, Macropus parryi
      - Red-necked wallaby, Macropus rufogriseus
    - Subgenus Osphranter
      - Antilopine kangaroo, Macropus antilopinus
      - Black wallaroo, Macropus bernadus
      - Common wallaroo, Macropus robustus
      - Red kangaroo, Macropus rufus
    - Subgenus Macropus
      - Western grey kangaroo, Macropus fuliginosus
      - Eastern grey kangaroo, Macropus giganteus
  - Genus Onychogalea
    - Bridled nail-tail wallaby, Onychogalea fraenata
    - †Crescent nail-tail wallaby, †Onychogalea lunata
    - Northern nail-tail wallaby, Onychogalea unguifera
  - Genus Petrogale
    - P. brachyotis species-group
      - Short-eared rock-wallaby, Petrogale brachyotis
      - Monjon, Petrogale burbidgei
      - Nabarlek, Petrogale concinna
    - P. xanthopus species-group
      - Proserpine rock-wallaby, Petrogale persephone
      - Rothschild's rock-wallaby, Petrogale rothschildi
      - Yellow-footed rock-wallaby, Petrogale xanthopus
    - P. lateralis/penicillata species-group
      - Allied rock-wallaby, Petrogale assimilis
      - Cape York rock-wallaby, Petrogale coenensis
      - Godman's rock-wallaby, Petrogale godmani
      - Herbert's rock-wallaby, Petrogale herberti
      - Unadorned rock-wallaby, Petrogale inornata
      - Black-flanked rock-wallaby, Petrogale lateralis
      - Mareeba rock-wallaby, Petrogale mareeba
      - Brush-tailed rock-wallaby, Petrogale penicillata
      - Purple-necked rock-wallaby, Petrogale purpureicollis
      - Mt. Claro rock-wallaby, Petrogale sharmani
  - Genus Setonix
    - Quokka: Setonix brachyurus
  - Genus Thylogale
    - Tasmanian pademelon, Thylogale billardierii
    - Brown's pademelon, Thylogale browni
    - Dusky pademelon, Thylogale brunii
    - Calaby's pademelon, Thylogale calabyi
    - Mountain pademelon, Thylogale lanatus
    - Red-legged pademelon, Thylogale stigmatica
    - Red-necked pademelon, Thylogale thetis
  - Genus Wallabia
    - Swamp wallaby or black wallaby, W. bicolor

References

^ ^a ^b 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. 58–70. OCLC 62265494. ISBN 0-801-88221-4.
^ Clode, D (2006). Continent Of Curiosities: A Journey Through Australian Natural History. Melbourne: Cambridge University Press. pp. 25–8. ISBN 978-0-521-86620-0.
^ Pope, PB (2011). "Isolation of Succinivibrionaceae implicated in low ethane emissions from Tammar Wallabies". Science. 333: 646. doi:10.1126/science.1205760.
^ Poole, WE (1984). Macdonald, D, ed. The Encyclopedia of Mammals. New York: Facts on File. pp. 862–71. ISBN 0-87196-871-1.
^ Luo, Z. X.; Yuan, C. X.; Meng, Q. J.; Ji, Q. (Aug 25, 2011). "A Jurassic eutherian mammal and divergence of marsupials and placentals". Nature. 476 (7361): 442–445. doi:10.1038/Nature10291.
^ The Paleobiology Database (2011). "Macropodidae (kangaroo)". The Paleobiology Database. Majura Park, ACT, Australia: Australian Research Council. Retrieved 2011-07-11.
^ Haaramo, M (20 December 2004). "Macropodidae: kenguroos". Mikko's Phylogeny Archive. Retrieved 15 March 2007.
^ Prideaux, GJ; Warburton, NM (2010). "An osteology-based appraisal of the phylogeny and evolution of kangaroos and wallabies (Macropodidae: Marsupialia)". Zoological Journal of the Linnean Society. 159 (4): 954–87. doi:10.1111/j.1096-3642.2009.00607.x.

External links

Data related to Macropodidae at Wikispecies
Media related to Macropus at Wikimedia Commons
The dictionary definition of kangaroo at Wiktionary

English Journal

Cytochrome P450 CYP3A in marsupials: cloning and identification of the first CYP3A subfamily member, isoform 3A70 from Eastern gray kangaroo (Macropus giganteus).

El-Merhibi A, Ngo SN, Marchant CL, Height TA, Stupans I, McKinnon RA.SourceWomen's and Children's Health Research Institute, Women's and Children's Hospital, North Adelaide, SA 5006, Australia.
Gene.Gene.2012 Sep 15;506(2):423-8. doi: 10.1016/j.gene.2012.06.024. Epub 2012 Jul 1.
Australian marsupials are unique fauna that have evolved and adapted to unique environments and thus it is likely that their detoxification systems differ considerably from those of well-studied eutherian mammals. Knowledge of these processes in marsupials is therefore vital to understanding the con
PMID 22759518

The high aerobic capacity of a small, marsupial rat-kangaroo (Bettongia penicillata) is matched by the mitochondrial and capillary morphology of its skeletal muscles.

Webster KN, Dawson TJ.SourceSchool of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW 2052, Australia. koa.webster@mq.edu.au
The Journal of experimental biology.J Exp Biol.2012 Sep 15;215(Pt 18):3223-30. doi: 10.1242/jeb.071365. Epub 2012 Jun 1.
We examined the structure-function relationships that underlie the aerobic capacities of marsupial mammals that hop. Marsupials have relatively low basal metabolic rates (BMR) and historically were seen as 'low energy' mammals. However, the red kangaroo, Macropus rufus (family Macropodidae), has aer
PMID 22660784

Japanese Journal

Phylogenetic Analysis of Diprotodontian Marsupials Based on Complete Mitochondrial Genomes

Genes & genetic systems 81(3), 181-191, 2006-06-25
NAID 10018212681

Collection and short-term preservation of semen from free-ranging eastern grey kangaroos (Macropus giganteus : Macropodidae)

Aust. Vet. J. 75, 648-651, 1997
NAID 30035706752

The early development of the incisor teeth of Setonix brachyurus (Macropodidae : Marsupialia) with special reference to the prelacteal teeth

Archs. Oral Biol 13, 171-190, 1968
NAID 30006544744

Related Pictures

Macropodidae Flickriver: Photoset 'Family: Macropodidae Macropodidae - kangaroos, wallabies Description Macropodidae skeleton.png Kangaroo | Basic Facts and Pictures | The Macropus rufus (Macropodidae) image 30313 Family Macropodidae (Kangaroos, Wallabies

★リンクテーブル★

リンク元	「Macropus」「カンガルー科」「kangaroo」「wallaby」

「Macropus」

Macropods; Temporal range: 28–0 Ma PreЄ Є O S D C P T J K Pg N Late Oligocene to recent
	Red-necked wallaby
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Class:	Mammalia
Infraclass:	Marsupialia
Order:	Diprotodontia
Suborder:	Macropodiformes
Family:	Macropodidae; Gray, 1821
Genera
	Dendrolagus; Dorcopsis; Dorcopsulus; Lagorchestes; Lagostrophus; Macropus; Onychogalea; Petrogale; Setonix; Thylogale; Wallabia;