Broad-faced potoroo

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. Sub-fossil remains indicate that it had an extensive distribution around the semiarid coastal districts of Southwest Australia.

Broad-faced potoroo[1]
Temporal range: Recent
↓
Stuffed specimen at the Natural History Museum Pisa

Extinct  (c. 1875)  (IUCN 3.1)[2]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Potoroidae
Genus: Potorous
Species:
†P. platyops
Binomial name
†Potorous platyops
(Gould, 1844)[3]

The habitat of the broad-faced potoroo is almost entirely unknown, but, unlike its relatives, such as the long-nosed Potorous tridactylus and long-footed Potorous longipes, they do not seem to have lived in dense under-stories in forests. Preserved specimens indicate that it was smaller than other potoroos at around 300 millimetres (one foot) long with a 180 mm tail. Their weight is estimated at 800 grams. 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.

Taxonomy

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]

The 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 than 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]

Description
Illustration by H. C. Richter in Gould's Mammals of Australia (1863)

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. 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]

Ecology

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 twentieth 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 the South African collector Guy C. Shortridge, writing in 1910, that ecological changes such as bushfire or 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]

Distribution

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 Plains, and perhaps as far north as the Northwest Cape region. Remains have also been found on Kangaroo Island.[16][6]

There is some evidence 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]

gollark: I couldn't say.
gollark: Probably other duplicates.
gollark: And two opensecurities.
gollark: Ah, you have two foamfixes.
gollark: What launcher is this with?

References
  1. Groves, C. P. (2005). "Order Diprotodontia". In Wilson, D. E.; Reeder, D. M (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 43–70. ISBN 978-0-8018-8221-0. OCLC 62265494.
  2. Australasian Mammal Assessment Workshop (2008). "Potorous platyops". IUCN Red List of Threatened Species. 2008. Retrieved 29 December 2008.CS1 maint: ref=harv (link) Database entry includes justification for why this species is listed as extinct
  3. Gould, J. (1844). "Exhibition and character of a number of animals, &c. transmitted from Australia by Mr. Gilbert". Proceedings of the Zoological Society of London. 1844: 103–104. Retrieved 27 March 2019.
  4. Claridge 2007, p. 5.
  5. "Species Potorous platyops (Gould, 1844)". Australian Faunal Directory. Australian Government. Retrieved 27 March 2019.
  6. Abbott, I. (2008). "Historical perspectives of the ecology of some conspicuous vertebrate species in south-west Western Australia" (PDF). Conservation Science W. Aust. 6 (3): 42–48.
  7. Finlayson, H. H. (1938). "On a new species of Potorous (Marsupialia) from a cave deposit on Kangaroo Island, South Australia". Transactions of the Royal Society of South Australia. 62: 132–140.
  8. Thomas, O. (1888). Catalogue of the Marsupialia and Monotremata in the collection of the British Museum (Natural History). London: Printed by order of the Trustees. p. 116.
  9. Bensley, B. A. (1903). "On the Evolution of the Australian Marsupialia ; with Remarks on the Relationships of the Marsupials in general". Transactions of the Linnean Society of London. 2. 9: 147–150.
  10. Waterhouse, G. R. (1846). A Natural History of the Mammalia. London: H. Baillière. pp. 231–232.
  11. Department of the Environment (2019). "Potorous platyops — Broad-faced Potoroo, Moda". Species Profile and Threats Database.
  12. Abbott, Ian (2001). "Aboriginal names of mammal species in south-west Western Australia". CALMScience. 3 (4): 451.
  13. Mitchell, P. C. (3 November 1908). "The secretary on additions to the menagerie". Proceedings of the Zoological Society of London. 78 (4): 783–786. doi:10.1111/j.1469-7998.1908.00783.x.
  14. Menkhorst, P. W.; Knight, F. (2011). A field guide to the mammals of Australia (3rd ed.). Melbourne: Oxford University Press. p. 108. ISBN 9780195573954.
  15. Claridge 2007, p. 28.
  16. Claridge 2007, pp. 17, 19, 84.
  17. Shortridge, G. C. (1910). "An account of the geographical distribution of the marsupials and monotremes of southwest Australia, having special reference to the specimens collected during the Balston Expedition of 1904-1907". Proceedings of the Zoological Society of London. Academic Press, [etc.] 1909: 803–848.
  18. Butler, W. H.; Merrilees, D. (1971). "Remains of Potorous platyopus (Marsupialia, Macropodidae) and other mammals from Bremer Bay, Western Australia". Journal of the Royal Society of Western Australia. 54: 53–58.
  19. McDowell, M. C.; Medlin, G. C. (2010). "Natural Resource Management implications of the pre-European non-volant mammal fauna of the southern tip of Eyre Peninsula, South Australia". Australian Mammalogy. 32 (2): 87. doi:10.1071/AM09020.

Sources
  • Claridge, A. W.; Seebeck, J. H.; Rose, R. (2007). Bettongs, potoroos, and the musky rat-kangaroo. Collingwood, Victoria: CSIRO Pub. ISBN 9780643093416.
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