Ekaltadeta

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Ekaltadeta
Temporal range: Late Oligocene–Miocene
Ekaltadeta ima.png
Restoration of Ekaltadeta ima
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Infraclass: Marsupialia
Order: Diprotodontia
Family: Hypsiprymnodontidae
Genus: Ekaltadeta
Mike Archer & Flannery, 1985 [1]
Species
  • Ekaltadeta imaArcher & Flannery, 1985 (type species)
  • Ekaltadeta jamiemulvaneyiWroe, 1996
  • Ekaltadeta wellingtonensisArcher & Flannery, 1985

Ekaltadeta is an extinct genus of marsupials related to the modern musky rat-kangaroos. [2] [3] [4] 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. [5] [6] 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. [6] 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. [7]

Contents

Fossils of the animals include two near complete skulls, and numerous upper and lower jaws.

Taxonomy

The description of a new species and genus was published by Mike Archer and Tim Flannery in 1985. The type species is Ekaltadeta ima . It was originally put within the family of Potoroidae, [8] but like the musky rat-kangaroo, the genus was moved to the family Hypsiprymnodontidae. [2] [4] [9] The diagnosis of the genus was revised in a 1996 study by Stephen Wroe of propleopine taxa, after new fossil specimens allowed for comparison with the type material and showcased new characteristics. [3] A largely complete skull of E. ima was described by Wroe in 1998 , prompting another reinvestigation of the propleonine clade which the author had suggested contained paraphyletic and polyphyletic species. [4] E. wellingtonensis has been tentatively placed as Proleopus wellingtonensis in more recent revisions of propleopine taxonomy. [3]

The name Ekaltadeta is derived from two words in an indigenous language associated with the McDonnell Ranges, combining the words for powerful, ekalta, and eta to describe the "powerful tooth". The specific epithet ima means "condemned to die" in the language of the same people. [1] The specific epithet jamiemulvaneyi refers to an honour given to J. Mulvaney as a supporter of the Riversleigh Society. [3]

Distribution

A member of the exclusively Australian clade Hypsiprymnodontidae, all three species of Ekaltadeta are known exclusively from the Riversleigh World Heritage Area in Queensland. [4] The specimens used in the description of E. jamiemulvaneyi were obtained at two sites in this area, the "Encore" and "Cleft of Ages" sites. Both of these sites are dated to the end of the Middle or the beginning of the late Miocene. [3]

See also

Related Research Articles

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<span class="mw-page-title-main">Thylacinidae</span> Extinct family of marsupials

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<span class="mw-page-title-main">Musky rat-kangaroo</span> Species of marsupial

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<span class="mw-page-title-main">Hypsiprymnodontidae</span> Family of marsupials

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<i>Hypsiprymnodon</i> Genus of marsupials

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<i>Palorchestes</i> Extinct genus of marsupial

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<span class="mw-page-title-main">Potoroo</span> 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.

<i>Wakaleo</i> Extinct genus of marsupials

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<span class="mw-page-title-main">Bettong</span> Genus of marsupials

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<i>Propleopus</i> Extinct genus of marsupials

Propleopus is an extinct genus of marsupials. Three species are known: P. chillagoensis from the Plio-Pleistocene, and P. oscillans and P. wellingtonensis from the Pleistocene. In contrast to most other kangaroos, and similar to their small extant relative, the musky rat-kangaroo, they were probably omnivorous.

Ganguroo is a genus of fossil macropods found at Riversleigh in Australia, material dating from the Middle to Late Miocene Epoch. The type species of the genus is Ganguroo bilamina, published in 1997. Two recently described species, Ganguroo bites and Ganguroo robustiter, have also been placed in this genus.

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Hypsiprymnodon karenblackae is a fossil species describing a small marsupial extant in Australia during the Early to Middle Miocene Epoch. The material was collected at the Australian Fossil Mammal Sites (Riversleigh). The taxon was published in 2014, along with several other new species of the genus Hypsiprymnodon, known as musky rat-kangaroos. The morphology of the teeth suggest it existed in a wet rainforest environment, similar to the ecological conditions of the extant species, the musky rat-kangaroo. The type specimen was collected at the Camel Sputum site, classified as a Faunal Zone B (Miocene) deposit at Riversleigh in northwestern Queensland, The epithet is for Dr. Karen Black's contribution to palaeontology in Australia, especially the Riversleigh fossils.

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.

Lekaneleo roskellyae is a fossil species of carnivorous marsupial that existed during the early Miocene in Australia. Once allied to the type species of the genus Priscileo, later placed as Wakaleo pitikantensis, "Priscileo" roskellyae was subsequently transferred to its own genus Lekaneleo.

Bettongia moyesi is a fossil species of potoroid marsupial.

References

  1. 1 2 Archer, M.; Flannery, T. (1985). "Revision of the Extinct Gigantic Rat Kangaroos (Potoroidae: Marsupialia), with Description of a New Miocene Genus and Species and a New Pleistocene Species of Propleopus". Journal of Paleontology. 59 (6): 1331–1349. ISSN   0022-3360. JSTOR   1304948.
  2. 1 2 "QMF12423 Ekaltadeta ima". learning.qm.qld.gov.au. Retrieved 2019-07-19.
  3. 1 2 3 4 5 Wroe, S. (1996). "An Investigation of Phylogeny in the Giant Extinct Rat Kangaroo Ekaltadeta (Propleopinae, Potoroidae, Marsupialia)". Journal of Paleontology. 70 (4): 681–690. doi:10.1017/S0022336000023635. ISSN   0022-3360. JSTOR   1306529.
  4. 1 2 3 4 Wroe, Stephen; Brammall, Jenni; Cooke, Bernard N. (July 1998). "The skull of Ekaltadeta ima (Marsupialia, Hypsiprymnodontidae?): An analysis of some marsupial cranial features and a re-investigation of propleopine phylogeny, with notes on the inference of carnivory in mammals". Journal of Paleontology. 72 (4): 738–751. doi:10.1017/S0022336000040439. ISSN   0022-3360.
  5. "Fossilworks: Ekaltadeta". fossilworks.org. Retrieved 17 December 2021.
  6. 1 2 "Killer Kangaroo". www.wakaleo.net. Archived from the original on 2017-08-22. Retrieved 2017-08-22.
  7. "Mammals - Fossil Mammals - The Killer Rat-Kangaroo's Tooth". 2008-09-19. Archived from the original on 2008-09-19. Retrieved 2017-08-22.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  8. "Potoroidae". 2007-06-11. Archived from the original on 2007-06-11. Retrieved 2017-08-23.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
  9. Wroe, S.; Archer, M. (July 1995). "Extraordinary diphyodonty-related change in dental function for a tooth of the extinct marsupial Ekaltadeta ima (Propleopinae, Hypsiprymnodontidae)". Archives of Oral Biology. 40 (7): 597–603. doi:10.1016/0003-9969(95)00010-M. PMID   7575230.