Broad-faced potoroo [1] | |
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Stuffed specimen at the Natural History Museum Pisa | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Infraclass: | Marsupialia |
Order: | Diprotodontia |
Family: | Potoroidae |
Genus: | Potorous |
Species: | †P. platyops |
Binomial name | |
†Potorous platyops | |
The broad-faced potoroo (Potorous platyops) 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.
The habitat of the broad-faced potoroo is almost entirely unknown, but unlike its relatives, such as the long-nosed potoroo Potorous tridactylus and long-footed Potorous longipes , they do not seem to have lived in dense understories in forests. Preserved specimens indicate that it was smaller than other potoroos at around 300 mm (1 ft) long with a 180-mm tail. Their weight is estimated at 800 g. Their coat was grizzled with yellowish hairs above and greyish white below. Their body was similar in shape to that of other potoroids. Their ears were small and rounded, muzzle fairly short, and cheeks notably puffy.
The first description was published by John Gould, [3] using a specimen obtained by his collector John Gilbert at "Walyema Swamps near Northam, Western Australia". [4] Gilbert visited this inland region while collecting around the recently established Swan River Colony. The site he referred to was determined to be Lake Walyormouring. [5]
The single specimen forwarded to Gould was presented to the Linnean Society of London, and the partial skull and skin of a female was deposited in the British Museum of Natural History. [3] [5] There were few collected after Gould's initial description. There was one animal collected by James Drummond and recorded in a letter in the 1840s, the collector George Masters prepared four specimens in the 1860s, presumably when he made a large collection of taxa at Mordup. The last collection of living Potorous platyops was in 1874, collected by William Webb and are now held at the Macleay Museum in Sydney. [6]
Curator and collector Hedley H. Finlayson described the remains of a potoroine animal found in a South Australian cave, which were similar to the Potorous platyops. However, the bones were retrieved from a site far from where the Potorous platyops was thought to be found, as well as the teeth being different from previously collections specimens. He ended up naming it as a new species, Potorous morgani. The specimen was later identified as a Potorous platyops. The skull that was studied and was held at a South Australian museum, amongst a deposit of multiple taxa from Kelly's Hill Caves, which was collected by A.M. Morgan. The specific epithet morgani refers to the collector. Finlayson's 1934 description recognised a close similarity to this species. When he obtained more specimens, which were collected at the same cave system on Kangaroo Island by Edith May, he obtained a second partial skull. [7] [5] Comparison of the dentition and other morphological characteristics was limited to works published by G. R. Waterhouse (1846), Oldfield Thomas (1888) and B. Arthur Bensley (1903) whose descriptions of P. platyops are recorded at the BMNH. [8] [9] [10]
Common names include broad-faced potoroo and a name from the Nyungar language, moda, [11] which was recorded by Gilbert and noted in Gould's 1844 description as mor-da, and mort or moort by other ecologists writing shortly after its extinction. [3] The name was obtained through an interview with Nyungar peoples at King George Sound by Gilbert. [12] [6] Early records show that it was also named the broad-faced rat kangaroo. [13]
The broad-faced potoroo is a member of the genus Potorous . It is described as having a relatively broad skull and shorter muzzle. [14] [12] The species is presumed to have become extinct sometime after the last recorded capture of the animal in 1875, and sometime before 1905.
The colour of the pelage is greyish brown at the upper-side. Straw-yellow hairs are interspersed through the fur to give a streaked effect. The underside and the flanks are pale grey. The head and body are about 305 millimetres in length, while the tail is about 178 mm long.[ clarification needed ] Their hind feet are about 54 mm in length and their weight is approximately 800 grams. [14] Their noses are short and blunt, which is an unusual characteristic among potorines and is usually associated with species such as the rufous bettong (Aepyprymnus rufescens) and the desert rat-kangaroo (Caloprymnus campestris). [15]
The behaviour of the species has not been recorded, [14] and nothing is known of its diet. The scant record of its habitat includes those provided by John Gilbert's informants, one of whom said, "All I could glean of its habits was that it was killed in a thicket surrounding one of the salt lagoons in the interior". [16]
An assessment of documents prior to the 20th century concluded the only ecological change to affect the population were anecdotal reports of a "disease", similar to one that had resulted in the sudden absence of similar species. A synthesis combining other historical evidence proposes what may have been an epizootic during the 1890s that precipitated their extinction. No historical evidence could be found to link the conclusion of South African collector Guy C. Shortridge, writing in 1910, that ecological changes such as bushfire and the introduction of cats were directly linked to the species' decline. [6] [17]
Guy Shortridge searched extensively for this species on his collecting expedition near Bremer Bay, finding Potorous gilbertii skulls at caves near Margaret River, but could only provide the historical details of this species provided to him in his 1910 report. The information he reported—assumed to be from Nyungar informants—was that the species became extinct in 1905, were similar to the quokka in range and habits, and had been commonly found and often captured in large quantities. [17] [6] The remains were examined the following year, along with the remains of a dibbler, which was found along with the P. gilbertii remains in a deposit beneath a moving dune system. Another set of bones were found in an midden beneath a large peppermint ( Agonis flexuosa ), which was assumed to be the feeding roost of a predatory bird such as an owl. This site, near Hunter River, was partly preserved by a sand dune and included species introduced after the colonisation of Australia, possibly placing the date of these remains within recent history. [18] [6] Sub-fossil remains identified as P. platyops were also found in a survey of deposits on the Eyre Peninsula, accumulations that may have been middens of pre-colonial peoples of the region. [19]
The few records of live specimens are restricted to Southwest Australia. The species could have already been near-extinct when Gilbert obtained his specimen, and no specific localities are known with any certainty. [14] [16] Sub-fossil remains indicate a wide distribution range, extending from the southern to the western regions of Australia, including Nullarbor Plain, and perhaps as far north as the Northwest Cape region. Remains have also been found on Kangaroo Island. [16] [6]
Some evidence indicates that P. platyops, like the desert-dwelling rat-kangaroo ( Caloprymnus campestris ), was already in decline when the invasive European rabbit became established in the species' former range. [16]
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.
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.
Thylacoleo is an extinct genus of carnivorous marsupials that lived in Australia from the late Pliocene to the Late Pleistocene, often known as marsupial lions. They were the largest and last members of the family Thylacoleonidae, occupying the position of apex predator within Australian ecosystems. The largest and last species, Thylacoleo carnifex, approached the weight of a lioness. The estimated average weight for the species ranges from 101 to 130 kg.
John Gilbert was an English naturalist and explorer. Gilbert is often cited in the earliest descriptions of many Australian animals, many of which were unrecorded in European literature, and some of these are named for him by those authors. Gilbert was sent to the newly founded Swan River Colony and made collections and notes on the unique birds and mammals of the surrounding region. He later joined expeditions to remote parts the country, continuing to make records and collections until he was killed during a violent altercation at Mitchell River (Queensland) on the Cape York Peninsula.
The woylie or brush-tailed bettong is a small, critically endangered mammal native to forests and shrubland of Australia. A member of the rat-kangaroo family (Potoroidae), it moves by hopping and is active at night, digging for fungi to eat. It is also a marsupial and carries its young in a pouch. Once widespread, the woylie mostly died out from habitat loss and introduced predators such as foxes. It is currently restricted to two small areas in Western Australia. There were two subspecies: B. p. ogilbyi in the west, and the now-extinct B. p. penicillata in the southeast.
The crescent nail-tail wallaby, also known as the worong, was a small species of marsupial that grazed on grasses in the scrub and woodlands of southwestern and central Australia. They were common in Western Australia before they disappeared in the early 20th century and persisted in the central deserts until at least the 1950s. The pelage was soft and silky and an ashen grey colouring overall, highlighted in part with rufous tones. There were light and dark patches of fur across the body, the moon-like crescents inspiring their names, and had attractive stripes on the face. Like the two remaining species of the genus, the northern Onychogalea unguifera and rare O. fraenata, it had a horny spur at the tip of its tail. The species was compared to a hare or rabbit, in its habits, appearance and taste, and weighed around 3.5 kilograms.
The desert rat-kangaroo, also called the buff-nosed rat-kangaroo, plains rat-kangaroo or oolacunta, is an extinct small hopping marsupial endemic to desert regions of Central Australia. It was first recorded in the early 1840s and described by John Gould in London in 1843, on the basis of three specimens sent to him by George Grey, the governor of South Australia at the time.
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.
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 long-nosed potoroo is a small, hopping mammal native to forests and shrubland of southeastern Australia and Tasmania. A member of the potoroo and bettong family (Potoroidae), it lives alone and digs at night for fungi, roots, or small insects. It is also a marsupial and carries its young in a pouch. The long-nosed potoroo is threatened by habitat loss and introduced species such as cats or foxes. There are two subspecies: P. t. tridactylus on mainland Australia, and P. t. apicalis on Tasmania, with lighter fur.
Gilbert's potoroo or ngilkat is Australia's most endangered marsupial, the rarest marsupial in the world, and one of the world's rarest critically endangered mammals, found in south-western Western Australia. It is a small nocturnal macropod that lives in small groups.
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.
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.
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.
The long-footed potoroo is a small marsupial found in southeastern Australia, restricted to an area around the coastal border between New South Wales and Victoria. It was first recorded in 1967 when an adult male was caught in a dog trap in the forest southwest of Bonang, Victoria. It is classified as vulnerable.
Bettongs, species of the genus Bettongia, are potoroine marsupials once common in Australia. They are important ecosystem 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.
Bettongia anhydra, also known as desert bettong, is a recently extinct species of potoroine marsupial.