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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.
The fauna of Australia consists of a large variety of animals; some 46% of birds, 69% of mammals, 94% of amphibians, and 93% of reptiles that inhabit the continent are endemic to it. This high level of endemism can be attributed to the continent's long geographic isolation, tectonic stability, and the effects of a unique pattern of climate change on the soil and flora over geological time. A unique feature of Australia's fauna is the relative scarcity of native placental mammals. Consequently, the marsupials – a group of mammals that raise their young in a pouch, including the macropods, possums and dasyuromorphs – occupy many of the ecological niches placental animals occupy elsewhere in the world. Australia is home to two of the five known extant species of monotremes and has numerous venomous species, which include the platypus, spiders, scorpions, octopus, jellyfish, molluscs, stonefish, and stingrays. Uniquely, Australia has more venomous than non-venomous species of snakes.
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".
The order Peramelemorphia includes the bandicoots and bilbies. All members of the order are endemic to Australia-New Guinea and most have the characteristic bandicoot shape: a plump, arch-backed body with a long, delicately tapering snout, very large upright ears, relatively long, thin legs, and a thin tail. Their size varies from about 140 grams up to 4 kilograms, but most species are about one kilogram.
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.
Riversleigh World Heritage Area is Australia's most famous fossil location, recognised for the series of well preserved fossils deposited from the Late Oligocene to more recent geological periods. The fossiliferous limestone system is located near the Gregory River in the north-west of Queensland, an environment that was once a very wet rainforest that became more arid as the Gondwanan land masses separated and the Australian continent moved north. The approximately 100 square kilometres (39 sq mi) area has fossil remains of ancient mammals, birds, and reptiles of the Oligocene and Miocene ages, many of which were discovered and are only known from the Riversleigh area; the species that have occurred there are known as the Riversleigh fauna.
The Alcoota Fossil Beds are an important paleontological Lagerstätte in the Northern Territory of Australia located on Alcoota Station in the locality of Anmatjere about 115 kilometres (71 mi) north-east of Alice Springs in the Central Australia region. It is notable for the occurrence of well-preserved, rare, Miocene vertebrate fossils, which provide evidence of the evolution of the Northern Territory’s fauna and climate. The Alcoota Fossil Beds are also significant as a research and teaching site for palaeontology students.
The mammals of Australia have a rich fossil history, as well as a variety of extant mammalian species, dominated by the marsupials, but also including monotremes and placentals. The marsupials evolved to fill specific ecological niches, and in many cases they are physically similar to the placental mammals in Eurasia and North America that occupy similar niches, a phenomenon known as convergent evolution. For example, the top mammalian predators in Australia, the Tasmanian tiger and the marsupial lion, bore a striking resemblance to large canids such as the gray wolf and large cats respectively; gliding possums and flying squirrels have similar adaptations enabling their arboreal lifestyle; and the numbat and anteaters are both digging insectivores. Most of Australia's mammals are herbivores or omnivores.
Palorchestes is an extinct genus of large terrestrial, herbivorous Australian marsupial of the family Palorchestidae, living from the Miocene through to the Late Pleistocene. Like other palorchestids, it had highly retracted nasal region suggesting that it had a prehensile lip, as well as highly unusual clawed forelimbs that were used to grasp vegetation.
Wakaleo is an extinct genus of medium-sized thylacoleonids that lived in Australia in the Late Oligocene and Miocene Epochs. Although much smaller than its close relative, the marsupial lion, Wakaleo would have been a successful hunter. It had teeth specially designed for cutting and stabbing. The genus is from an extinct family of Vombatiformes, so it is distantly related to the herbivorous wombats.
Ekaltadeta is an extinct genus of marsupials related to the modern musky rat-kangaroos. Ekaltadeta was present in what is today the Riversleigh formations in Northern Queensland from the Late Oligocene to the Miocene, and the genus includes three species. The genus is hypothesized to have been either exclusively carnivorous, or omnivorous with a fondness for meat, based on the chewing teeth found in fossils. This conclusion is based mainly on the size and shape of a large buzz-saw-shaped cheek-tooth, the adult third premolar, which is common to all Ekaltadeta.
Ngamalacinus timmulvaneyi lived during the early Miocene and has been found in Riversleigh.
Malleodectes is an extinct genus of unusual marsupial, first discovered in 2011 at Riversleigh, Queensland, Australia.
Joculusium muizoni is a fossil species discovered at the Riversleigh World Heritage Area. Little is known about the animal.
Macroderma malugara is a species of bat known from fossil material found in Australia. The name describes a 'good killer' in the local language, and was similar in size and probably habits of the modern Macroderma gigas. They ate a wide variety of animals in their rainforest environment, including birds, turtles, small crocodiles and other bats.
Karen H. Black, born about 1970, is a palaeontologist at the University of New South Wales. Black is the leading author on research describing new families, genera and species of fossil mammals. She is interested in understanding faunal change and community structure in order to gain new understandings of past, current and future changes in biodiversity which are driven by climate.
Australia Walkabout Wildlife Park is a wildlife sanctuary located in Calga, New South Wales, Australia. The wildlife park is home to Australian native birds, mammals and reptiles as well as farm animals. It offers research and education programs, with visitors able to undertake day and night tours. The park is home to a wide range of Australian animals and in 2021 became home to a group of meerkats, the park's first exotic animals.
References
- ↑ "Faunal zones". Faunal encyclopedia. wakaleo.net. Retrieved 28 May 2019.
- ↑ "About wakaleo.net". Faunal encyclopaedia. wakaleo.net. Retrieved 28 May 2019.
- ↑ Archer, M.; et al. (1 January 2006). "Current status of species-level representation in faunas from selected fossil localities in the Riversleigh World Heritage Area, northwestern Queensland" (PDF). Alcheringa: An Australasian Journal of Palaeontology. 30 (sup1): 1–17. doi:10.1080/03115510609506851. ISSN 0311-5518. S2CID 56390817.
- ↑ "Mammals (Mammalia)". Riversleigh faunal encyclopedia. wakaleo.net. Retrieved 28 May 2019.
- ↑ Long, J.A.; Archer, M. (2002). Prehistoric Mammals of Australia and New Guinea: One Hundred Million Years of Evolution. UNSW Press. p. 184. ISBN 9780868404356.
- ↑ "Cave yields marsupial fossil haul". BBC News . 19 July 2010. Retrieved 5 August 2010.
- 1 2 3 Dan Gaffney (19 December 2009). "Loud and lazy but didn't chew gum: Ancient koalas". PhysOrg . PhysOrg.com. Retrieved 5 August 2010.