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Alosa Vistonica
''Alosa vistonica'' the Thracian shad, is a species of shad, a freshwater fish in the family Alosidae. It is endemic to a single shallow lake, Lake Vistonida in Greece. It is classified as critically endangered (CR) and is threatened by sewage, industrial effluents, destruction of spawning sites by agricultural development and increased salinity following the opening of a canal into the sea. It has been suspected to be extinct already. Short description ''A. vistonica'' reaches a maximum length of 17 cm ( SL). It is distinguished from other members of its genus entering freshwater of the Mediterranean basin by having 78–97 gill rakers and well-developed teeth on the palatine and vomer, especially in juveniles. See also * Killarney shad The Killarney shad (''Alosa killarnensis''), also called the goureen, is a freshwater fish in the family ''Clupeidae'', endemic to a single lake in Ireland, Lough Leane in County Kerry. Research has shown that it is a landlocked subsp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panos Stavros Economidis
Panos may refer to: People with the given name Panos is the diminutive of Panagiotis (Panayiotis), a Christian name. * Panos Antsaklis, American engineer *Panos Aravantinos (1886–1930), Greek and German opera scenery and costume designer and decorator *Panos Armenakas (born 1998), American-born Australian footballer * Panos Bardis (1924–1996), Greek American sociologist * Panos Constantinou (born 1985), Cypriot footballer *Panos Cosmatos (born 1974), Italian-Canadian film director and screenwriter *Panos Gavalas (1926–1988), Greek singer * Panos Ioannides, Cypriot novelist and playwright * Panos Ioannou (1951–2005), Cypriot biologist and neuroscientist *Panos Ipeirotis (born 1976), Greek professor * Panos Kalaitzakis (born 1999), Greek basketball player * Panos Kallitsis (born 1974), Greek hairstylist and make-up artist *Panos Kammenos (born 1965), Greek politician *Panos Karan (born 1982), British classical pianist, conductor and composer of Greek origin *Panos Kiamos, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Palatine Bone
In anatomy, the palatine bones () are two irregular bones of the facial skeleton in many animal species, located above the uvula in the throat. Together with the maxillae, they comprise the hard palate. (''Palate'' is derived from the Latin ''palatum''.) Structure The palatine bones are situated at the back of the nasal cavity between the maxilla and the pterygoid process of the sphenoid bone. They contribute to the walls of three cavities: the floor and lateral walls of the nasal cavity, the roof of the mouth, and the floor of the orbits. They help to form the pterygopalatine and pterygoid fossae, and the inferior orbital fissures. Each palatine bone somewhat resembles the letter L, and consists of a horizontal plate, a perpendicular plate, and three projecting processes—the pyramidal process, which is directed backward and lateral from the junction of the two parts, and the orbital and sphenoidal processes, which surmount the vertical part, and are separated by a dee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fish Described In 1986
Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of living fish species are ray-finned fish, belonging to the class Actinopterygii, with around 99% of those being teleosts. The earliest organisms that can be classified as fish were soft-bodied chordates that first appeared during the Cambrian period. Although they lacked a true spine, they possessed notochords which allowed them to be more agile than their invertebrate counterparts. Fish would continue to evolve through the Paleozoic era, diversifying into a wide variety of forms. Many fish of the Paleozoic developed external armor that protected them from predators. The first fish with jaws appeared in the Silurian period, after which many (such as sharks) became formidable marine predators rather than just the prey of arthropods. Most fis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Critically Endangered Fish
As of July 2017, the International Union for Conservation of Nature (IUCN) lists 1,000 critically endangered fish species, including 87 which are tagged as ''possibly extinct''. 3.0% of all evaluated fish species are listed as critically endangered. The IUCN also lists four fish subspecies as critically endangered. Of the subpopulations of fish evaluated by the IUCN, 20 species subpopulations and one subspecies subpopulation have been assessed as critically endangered. Additionally 3191 fish species (21% of those evaluated) are listed as '' data deficient'', meaning there is insufficient information for a full assessment of conservation status. As these species typically have small distributions and/or populations, they are intrinsically likely to be threatened, according to the IUCN. While the category of ''data deficient'' indicates that no assessment of extinction risk has been made for the taxa, the IUCN notes that it may be appropriate to give them "the same degree of at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Xanthi (regional Unit)
Xanthi (, el, Περιφερειακή ενότητα Ξάνθης, Turkish: İskeçe) is one of the regional units of Greece. It is part of the Region of East Macedonia and Thrace. The capital is Xanthi. Together with the regional units Rhodope and Evros, it forms the geographical region of Western Thrace. Geography Xanthi borders the Bulgarian provinces of Smolyan and Kardzhali to the north, and the Aegean Sea to the south. The regional unit of Kavala lies to the west, Drama to the northwest and Rhodope to the east. The Rhodope Mountains cover the northern part of the regional unit. The highest point is ''Koula'', at 1,827m. The coastal area has a predominantly Mediterranean climate, whereas the northern mountainous part has a colder continental climate. Administration The regional unit Xanthi is subdivided into 4 municipalities. These are (number as in the map in the infobox): * Abdera (''Avdira'', 2) *Myki (3) *Topeiros (4) *Xanthi (1) Prefecture Xanthi was establishe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freshwater Fish Of Europe
Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. Although the term specifically excludes seawater and brackish water, it does include non- salty mineral-rich waters such as chalybeate springs. Fresh water may encompass frozen and meltwater in ice sheets, ice caps, glaciers, snowfields and icebergs, natural precipitations such as rainfall, snowfall, hail/ sleet and graupel, and surface runoffs that form inland bodies of water such as wetlands, ponds, lakes, rivers, streams, as well as groundwater contained in aquifers, subterranean rivers and lakes. Fresh water is the water resource that is of the most and immediate use to humans. Water is critical to the survival of all living organisms. Many organisms can thrive on salt water, but the great majority of higher plants and most insects, amphibians, reptiles, mammals and birds need fresh water to survive. Fresh water i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endemic Fauna Of Greece
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. For example, the Cape sugarbird is found exclusively in southwestern South Africa and is therefore said to be ''endemic'' to that particular part of the world. An endemic species can be also be referred to as an ''endemism'' or in scientific literature as an ''endemite''. For example '' Cytisus aeolicus'' is an endemite of the Italian flora. '' Adzharia renschi'' was once believed to be an endemite of the Caucasus, but it was later discovered to be a non-indigenous species from South America belonging to a different genus. The extreme opposite of an endemic species is one with a cosmopolitan distribution, having a global or widespread range. A rare alternative term for a species that is endemic is "precinctive", which applies to s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alosa
''Alosa'' is a genus of fish, the river herrings, in the family (biology), family Clupeidae. Along with other genera in the subfamily Alosinae, they are generally known as shads.[ftp://ftp.fao.org/docrep/fao/009/ac482e/ac482e27.pdf Subfamily Alosinae] FAO Fisheries Bulletin They are distinct from other herrings by having a deeper body and spawning in rivers. Several species can be found on both sides of the Atlantic Ocean and the Mediterranean Sea. Also, several taxa occur in the brackish-water Caspian Sea and the Black Sea basin. Many are found in fresh water during spawning and some are only found in landlocked fresh water. Fossil record These fishes lived from the Eocene to Quaternary (from 55 million years ago to now). Fossils have been found in Canada, the United States, Greece, Kazakhstan, Azerbaijan, Hungary, Romania, and Italy. Appearance ''Alosa'' species are generally dark on the back and top of the head, with blue, violet, or greenish tints. Some can be identified ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Killarney Shad
The Killarney shad (''Alosa killarnensis''), also called the goureen, is a freshwater fish in the family ''Clupeidae'', endemic to a single lake in Ireland, Lough Leane in County Kerry. Research has shown that it is a landlocked subspecies of the anadromous, twait shad (''Alosa fallax''), arriving in the lake after the Last Glacial Maximum about 10,000 years ago. This fish is at risk from eutrophication and the introduction of alien species of fish to the lake and the International Union for Conservation of Nature has rated it as " critically endangered". Distribution and status Lough Leane in the Killarney National Park, southwestern Ireland, is only the place where this fish lives. It has been listed as critically endangered by the IUCN. Eutrophication and introduction of alien fish species such as common roach ''Rutilus rutilus'' and common bream ''Abramis brama'' are the most probable threats. The shad is also very sensitive to pollution. The adopted method for conservati ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vomer
The vomer (; lat, vomer, lit=ploughshare) is one of the unpaired facial bones of the skull. It is located in the midsagittal line, and articulates with the sphenoid, the ethmoid, the left and right palatine bones, and the left and right maxillary bones. The vomer forms the inferior part of the nasal septum in humans, with the superior part formed by the perpendicular plate of the ethmoid bone. The name is derived from the Latin word for a ploughshare and the shape of the bone. In humans The vomer is situated in the median plane, but its anterior portion is frequently bent to one side. It is thin, somewhat quadrilateral in shape, and forms the hinder and lower part of the nasal septum; it has two surfaces and four borders. The surfaces are marked by small furrows for blood vessels, and on each is the nasopalatine groove, which runs obliquely downward and forward, and lodges the nasopalatine nerve and vessels. Borders The ''superior border'', the thickest, presents a dee ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gill Raker
Gill rakers in fish are bony or cartilaginous processes that project from the branchial arch (gill arch) and are involved with suspension feeding tiny prey. They are not to be confused with the gill filaments that compose the fleshy part of the gill used for gas exchange. Rakers are usually present in two rows, projecting from both the anterior and posterior side of each gill arch. Rakers are widely varied in number, spacing, and form. By preventing food particles from exiting the spaces between the gill arches, they enable the retention of food particles in filter feeders. The structure and spacing of gill rakers in fish determines the size of food particles trapped, and correlates with feeding behavior. Fish with densely spaced, elongated, comb-like gill rakers are efficient at filtering tiny prey, whereas carnivores and omnivores often have more widely spaced gill rakers with secondary projections. Because gill raker characters often vary between closely related taxa, they are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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