Ekaltadeta Temporal range: | |
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Restoration of Ekaltadeta ima | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Infraclass: | Marsupialia |
Order: | Diprotodontia |
Family: | Hypsiprymnodontidae |
Genus: | † Ekaltadeta Mike Archer & Flannery, 1985 [1] |
Species | |
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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]
Fossils of the animals include two near complete skulls, and numerous upper and lower jaws.
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]
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]
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.
Thylacinidae is an extinct family of carnivorous marsupials from the order Dasyuromorphia. The only species to survive into modern times was the thylacine, which became extinct in 1936.
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 Hypsiprymnodontidae are a family of macropods, one of two families containing animals commonly referred to as rat-kangaroos. The single known extant genus and species in this family, the musky rat-kangaroo, Hypsiprymnodon moschatus, occurs in northern Australia. During the Pleistocene, this family included the megafauna genus Propleopus.
Hypsiprymnodon is a genus of macropods. The sole extant species is Hypsiprymnodon moschatus, the musky rat-kangaroo. The genus includes four known fossil species.
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.
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.
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.
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.
Barinya is a fossil genus from the marsupial family Dasyuridae, which contains the oldest known undoubted dasyurid.
Nambaroo is an extinct genus of macropod marsupial from the late Oligocene to the early Miocene of Australia.
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.
The Macropodidae are an extant family of marsupial with the distinction of the ability to move bipedally on the hind legs, sometimes by jumping, as well as quadrupedally. They are herbivores, but some fossil genera like Ekaltadeta are hypothesised to have been carnivores. The taxonomic affiliations within the family and with other groups of marsupials is still in flux.
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.
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