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Parachanna Fayumensis
''Parachanna fayumensis'', is an extinct member of the snakehead fish family (Channidae) known from fossil records only. It is the oldest member of this family known from Africa. It differs from ''Parachanna insignis'', '' P. africana'' and '' P. obscura'' by presence of prominent raised tooth patch with well-developed tooth sockets on a ventral surface of parasphenoid posterior end. Several skull bones were found in the upper Eocene and lower Oligocene Jebel Qatrani Formation of the Fayum Depression, Egypt. The zoogeographic importance of this fossil material is that it suggests a Channid migration from India to Africa long before the Miocene The Miocene ( ) is the first epoch (geology), 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 mea ....''Ibid'' p. 1176 References External links snakeheads.org fayumensis Prehistoric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eocene
The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes from the Ancient Greek (''ēṓs'', "dawn") and (''kainós'', "new") and refers to the "dawn" of modern ('new') fauna that appeared during the epoch. The Eocene spans the time from the end of the Paleocene Epoch to the beginning of the Oligocene Epoch. The start of the Eocene is marked by a brief period in which the concentration of the carbon isotope Carbon-13, 13C in the atmosphere was exceptionally low in comparison with the more common isotope Carbon-12, 12C. The end is set at a major extinction event called the ''Grande Coupure'' (the "Great Break" in continuity) or the Eocene–Oligocene extinction event, which may be related to the impact of one or more large bolides in Popigai impact structure, Siberia and in what is now ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alison M
Alison may refer to: People * Alison (given name), including a list of people with the name * Alison (surname) Music * ''Alison'' (album), aka ''Excuse Me'', a 1975 album by Australian singer Alison MacCallum * "Alison" (song), song by Elvis Costello * "Alison (C'est ma copine à moi)", a 1993 single by Jordy * "Alison", 1994 single by Slowdive Places * Alison, New South Wales, suburb of the Central Coast region in NSW, Australia * Alison Sound, an inlet on the Central Coast of British Columbia, Canada * Point Alison, Alberta, a summer village in Alberta, Canada Other uses * ''Alison'' (film), a South African documentary film * ALISON (company), an educational technology company * Alison, common name for plants of the genus ''Alyssum'', including: ** Sweet alison, a decorative plant * ''Alison'' (katydid) a genus in the Hexacentrinae subfamily of bush crickets See also * Alisoun (other) * Alisson (other) * Allison (other) * Allisson (disa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Channidae
The snakeheads are members of the freshwater perciform fish family Channidae, native to parts of Africa and Asia. These elongated, predatory fish are distinguished by their long dorsal fins, large mouths, and shiny teeth. They breathe air with gills, which allows them to migrate short distances over land. They have suprabranchial organs, which are primitive forms of labyrinth organs, that develop when they grow older. The two extant genera are ''Channa'' in Asia and ''Parachanna'' in Africa, consisting of more than 50 species. They are valuable as a food source and have become notorious as an intentionally released invasive species. These fish have been kept as pets but as they get larger, people let them go into ponds, lakes, and rivers, making these fish invasive. Description The various species of snakeheads differ greatly in size; dwarf snakeheads, such as ''Channa orientalis'', do not surpass in length. Most other snakeheads reach between . Five species ('' C. argus'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parachanna Insignis
''Parachanna insignis'' is a species of ray-finned fish from the snakehead family, Channidae The snakeheads are members of the freshwater perciform fish family Channidae, native to parts of Africa and Asia. These elongated, predatory fish are distinguished by their long dorsal fins, large mouths, and shiny teeth. They breathe air with ... from western central Africa. References insignis Fish described in 1884 {{Anabantiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parachanna Africana
''Parachanna africana'', the African snakehead or Niger snakehead, is a species of fish from west-central Africa. Little is published on its biology. Limited primarily to coastal sections of rivers, it is thought to be a nest-building, thrust predator like other Channidae.Courtenay Jr., Walter R. and James D. WilliamsParachanna africana ''USGS Circular 1251: Snakeheads (Pisces, Chinnidae) – A Biological Synopsis and Risk Assessment''. U.S. Department of the Interior, U.S. Geological Survey. 2004-04-01. Retrieved 2007-07-15. Its native range is southern Benin to southern Nigeria, primarily the Oueme River and the basin of the Niger River The Niger River ( ; ) is the main river of West Africa, extending about . Its drainage basin is in area. Its source is in the Guinea Highlands in south-eastern Guinea near the Sierra Leone border. It runs in a crescent shape through .... This specie also referred to as "African snake Head" or "Niger snake head" is uncommon in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parachanna Obscura
The obscure snakehead, ''Parachanna obscura'', is a medium-sized carnivorous fish that has an elongated shape tapered on both ends and is covered in medium circular scales (cycloid). The head, resembling a snake, is long and depressed anteriorly and covered with cycloid scales slightly larger than those scales on the body. This species is found in central Africa along the western coastline from as far north as Senegal to as far south as Zaire and into central Africa into southwest Sudan. Geographic range Four identified ''Parachanna'' species originate within the continent of Africa. They include ''P. fayumensis'' (fossil), ''P. africana'', ''P. insignis'', and the most common, ''P. obscura''. ''P. africana'' is restricted to Benin, Nigeria, and into Gabon, ''P. insignis'' is found throughout the Congo River basin in Congo and into Gabon, and ''P. obscura'' is the most widespread of the African species, being found in the Lake Chad basin, and the Nile, Zaire, Cross, Niger, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasphenoid
The parasphenoid is a bone which can be found in the cranium of many vertebrates. It is an unpaired dermal bone which lies at the midline of the roof of the mouth. In many reptiles (including birds), it fuses to the endochondral (cartilage-derived) basisphenoid bone of the lower braincase, forming a bone known as the parabasisphenoid. Early mammals have a small parasphenoid, but for the most part its function has been replaced by the vomer bone. The parasphenoid has been lost in placental mammals and caecilian amphibians. See also *Ossification of frontal bone *Terms for anatomical location Standard anatomical terms of location are used to unambiguously describe the anatomy of animals, including humans. The terms, typically derived from Latin or Greek roots, describe something in its standard anatomical position. This position prov ... References Bones of the head and neck {{musculoskeletal-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oligocene
The Oligocene ( ) is a geologic epoch of the Paleogene Period and extends from about 33.9 million to 23 million years before the present ( to ). As with other older geologic periods, the rock beds that define the epoch are well identified but the exact dates of the start and end of the epoch are slightly uncertain. The name Oligocene was coined in 1854 by the German paleontologist Heinrich Ernst Beyrich from his studies of marine beds in Belgium and Germany. The name comes from the Ancient Greek (''olígos'', "few") and (''kainós'', "new"), and refers to the sparsity of extant forms of molluscs. The Oligocene is preceded by the Eocene Epoch and is followed by the Miocene Epoch. The Oligocene is the third and final epoch of the Paleogene Period. The Oligocene is often considered an important time of transition, a link between the archaic world of the tropical Eocene and the more modern ecosystems of the Miocene. Major changes during the Oligocene included a global expansion o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jebel Qatrani Formation
The Jebel Qatrani Formation (also Gebel Qatrani) is a palaeontological and geologic formation located in the Faiyum Governorate of central Egypt. Conformably overlying the Qasr el Sagha Formation. It is exposed namely between the Jebel Qatrani escarpment and the Qasr el Sagha escarpment, north of Birket Qarun lake near Faiyum. Geology These rocks were laid down in the Eocene- Oligocene period ( Priabonian - Rupelian). This formation was originally thought to be between 35.4 and 33.3 million years old, based on initial analysis of the formation. However, analysis by Erik Seiffert in 2006 concluded that the age of the Jebel Qatrani Formation should be revised. His assessment of more recent evidence indicates an age for most of the formation of between 30.2 and 29.5 million years ago, placing it almost entirely in the Early Oligocene. Seiffert states that only the lowest 48 metres was laid down in the Eocene, but recent opinion holds the original hypothesis of a sediment straddli ... [...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] |
Parachanna
''Parachanna'' is a genus of snakeheads native to freshwater habitats in tropical Africa. Three recognized extant (living) species are in this genus, but a phylogenetic study from 2017 indicates that a fourth, currently undescribed species also exists. One fossil species, ''Parachanna fayumensis'' Murray, 2006 dated to the Upper Eocene and Lower Oligocene is known from the Jebel Qatrani Formation of the Fayum Depression, Egypt. Species The three recognized extant species in this genus are: * ''Parachanna africana'' ( Steindachner, 1879) (African snakehead) * ''Parachanna insignis'' ( Sauvage, 1884) (brown snakehead) * ''Parachanna obscura The obscure snakehead, ''Parachanna obscura'', is a medium-sized carnivorous fish that has an elongated shape tapered on both ends and is covered in medium circular scales (cycloid). The head, resembling a snake, is long and depressed anteriorly ...'' ( Günther, 1861) (obscure snakehead) References * Freshwater fish genera Tax ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Fish Of Africa
Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus Valley Civilisation, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
