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Ekaltadeta Ima
''Ekaltadeta ima'' is a species of potoroid marsupial that existed in Miocene Australia. Taxonomy The description of ''Ekaltadeta ima'' was assigned to a new genus ''Ekaltadeta'' as the type species in a study of fossil specimens published by Mike Archer and Tim Flannery in 1985. The specific diagnosis of the type and genus was revised in a 1996 study by Stephen Wroe of propleonine taxa, when new fossil specimens allowed comparison with the type material and provided direct evidence of other characteristics. 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. 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 la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mike Archer (paleontologist)
Professor Michael Archer AM, FAA, Dist FRSN (born 1945, Sydney, New South Wales) is an Australian paleontologist specialising in Australian vertebrates. He is a professor at the School of Biological, Earth & Environmental Sciences, University of New South Wales. His previous appointments include Director of the Australian Museum 1999–2004 and Dean of Science at the University of New South Wales 2004–2009. Education and career Archer was born in Sydney but raised in the United States and studied at Princeton University. From 1972 to 1978, he was the curator of mammals at the Queensland Museum. Since 1983, he has been involved with the exploration of the Riversleigh fossil site in Queensland. He is opposed to creationism and regularly engages in active debates with creationists. During his time as director of the Australian Museum, he was the initiator of attempts to clone the ''Thylacinus cynocephalus'', the Tasmanian tiger, an animal extinct since 1936. Archer has stat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tim Flannery
Timothy Fridtjof Flannery (born 28 January 1956) is an Australian mammalogist, palaeontologist, environmentalist, Conservation biology, conservationist, Exploration, explorer, author, Science communication, science communicator, activist and public scientist. He was awarded Australian of the Year in 2007 for his work and advocacy on environmental issues. Flannery grew up in Sandringham, Victoria, Sandringham, and studied English at La Trobe University in 1977. He then switched disciplines to pursue paleontology. As a researcher, Flannery had roles at several universities and museums in Australia, specialising in fossil Marsupial, marsupials and Evolution of mammals, mammal evolution. He made notable contributions to the palaeontology of Australia and New Guinea during the 1980s, including reviewing the evolution and fossil records of Phalangeridae and Macropodidae. While mammal curator at the Australian Museum, he undertook a survey of the mammals of Melanesia, where he identif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potoroid
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. Taxonomy The potoroids are smaller relatives of the kangaroos and wallabies, and may be ancestral to that group. In particular, the teeth show a simpler pattern than in the kangaroo family, with longer upper incisors, larger canines, and four cusps on the molars. However, both groups possess a wide diastema between the incisors and the cheek teeth, and the potoroids have a similar dental formula to their larger relatives: In most respects, however, the potoroids are similar to small wallabies. Their hind feet are elongated, and they move by hopping, although the adaptations are not as extreme as they are in true wallabies, and, like rabbits, they often use their fore limbs to move about at slower speeds. The potoroids are, like nearly all diprotodonts, herbivorous. H ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Miocene
The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recent" because it has 18% fewer modern marine invertebrates than the Pliocene has. The Miocene is preceded by the Oligocene and is followed by the Pliocene. As Earth went from the Oligocene through the Miocene and into the Pliocene, the climate slowly cooled towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event but consist rather of regionally defined boundaries between the warmer Oligocene and the cooler Pliocene Epoch. During the Early Miocene, the Arabian Peninsula collided with Eurasia, severing the connection between the Mediterranean and Indian Ocean, and allowing a faunal interchange to occur between Eurasia and Africa, including the dispersal of proboscideans into Eurasia. During the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ekaltadeta
''Ekaltadeta'' is an extinct genus of marsupials related to the modern musky rat-kangaroos. ''Ekaltadelta'' was present in what is today the Riversleigh formations in Northern Queensland from the Late Oligocene to the Miocene. They are hypothesized to have been either exclusively carnivorous, or omnivorous with a fondness for meat, based on their chewing teeth. 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''. A few specimens actually did also have long predatory "fangs". 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, but like the musky rat-kangaroo, the genus was moved to the family Hypsiprymnodontidae. The name ''Ekaltadet ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type Species
In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specimen(s). Article 67.1 A similar concept is used for suprageneric groups and called a type genus. In botanical nomenclature, these terms have no formal standing under the code of nomenclature, but are sometimes borrowed from zoological nomenclature. In botany, the type of a genus name is a specimen (or, rarely, an illustration) which is also the type of a species name. The species name that has that type can also be referred to as the type of the genus name. Names of genus and family ranks, the various subdivisions of those ranks, and some higher-rank names based on genus names, have such types. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stephen Wroe
Stephen or Steven is a common English first name. It is particularly significant to Christians, as it belonged to Saint Stephen ( grc-gre, Στέφανος ), an early disciple and deacon who, according to the Book of Acts, was stoned to death; he is widely regarded as the first martyr (or "protomartyr") of the Christian Church. In English, Stephen is most commonly pronounced as ' (). The name, in both the forms Stephen and Steven, is often shortened to Steve or Stevie. The spelling as Stephen can also be pronounced which is from the Greek original version, Stephanos. In English, the female version of the name is Stephanie. Many surnames are derived from the first name, including Stephens, Stevens, Stephenson, and Stevenson, all of which mean "Stephen's (son)". In modern times the name has sometimes been given with intentionally non-standard spelling, such as Stevan or Stevon. A common variant of the name used in English is Stephan ; related names that have found some curre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paraphyletic
In taxonomy (general), taxonomy, a group is paraphyletic if it consists of the group's most recent common ancestor, last common ancestor and most of its descendants, excluding a few Monophyly, monophyletic subgroups. The group is said to be paraphyletic ''with respect to'' the excluded subgroups. In contrast, a monophyletic group (a clade) includes a common ancestor and ''all'' of its descendants. The terms are commonly used in phylogenetics (a subfield of biology) and in the tree model of historical linguistics. Paraphyletic groups are identified by a combination of Synapomorphy and apomorphy, synapomorphies and symplesiomorphy, symplesiomorphies. If many subgroups are missing from the named group, it is said to be polyparaphyletic. The term was coined by Willi Hennig to apply to well-known taxa like Reptilia (reptiles) which, as commonly named and traditionally defined, is paraphyletic with respect to mammals and birds. Reptilia contains the last common ancestor of reptiles a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polyphyletic
A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of convergent evolution. The arrangement of the members of a polyphyletic group is called a polyphyly .. ource for pronunciation./ref> It is contrasted with monophyly and paraphyly. For example, the biological characteristic of warm-bloodedness evolved separately in the ancestors of mammals and the ancestors of birds; "warm-blooded animals" is therefore a polyphyletic grouping. Other examples of polyphyletic groups are algae, C4 photosynthetic plants, and edentates. Many taxonomists aim to avoid homoplasies in grouping taxa together, with a goal to identify and eliminate groups that are found to be polyphyletic. This is often the stimulus for major revisions of the classification schemes. Researchers concerned more with ecology than with systema ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
McDonnell Ranges
The MacDonnell Ranges, or Tjoritja in Arrernte, is a mountain range located in southern Northern Territory. MacDonnell Ranges is also the name given to an interim Australian bioregion broadly encompassing the mountain range, with an area of .IBRA Version 6.1 data The range is a long series of mountains in central , consisting of parallel ridges running to the east and west of . The mountain range contains many spectacular gaps and gorges as well as areas of A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Riversleigh World Heritage Area
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 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 fossils at Riversleigh are unusual because they are found in soft freshwater limestone which has not been compacted. This means the animal remains retain their three-dimensional structure, rather than being partially crushed like in most fossil sites. The area is locat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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