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Urolophus
''Urolophus'' is a genus of round rays mostly native to the western Pacific Ocean and the Indian Ocean, though one species occurs in the Pacific waters of the Mexican coast. Müller and Henle erected ''Urolophus'' in an 1837 issue of ''Bericht Akademie der Wissenschaften zu Berlin''. The name is derived from the Greek ''oura'', meaning "tail", and ''lophos'', meaning "crest". In ''Urolophus'', the outer rims of the nostrils are not enlarged into lobes, but may form a small knob at the back. A fossil species, ''Urolophus crassicaudatus'', has been found in Monte Bolca, northern Italy, in deposits dating back to the late Ypresian stage of the Eocene epoch (49 Ma); however, Marramà ''et al.'' (2020) transferred this species to the genus '' Arechia''. Species There are currently 21 recognized species in this genus: * '' Urolophus aurantiacus'' J. P. Müller & Henle, 1841 (Sepia stingray) * †'' Urolophus bicuneatus'' Noetling, 1885 * '' Urolophus bucculentus'' W. J. Macleay, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Bicuneatus
''Urolophus'' is a genus of round rays mostly native to the western Pacific Ocean and the Indian Ocean, though one species occurs in the Pacific waters of the Mexican coast. Müller and Henle erected ''Urolophus'' in an 1837 issue of ''Bericht Akademie der Wissenschaften zu Berlin''. The name is derived from the Greek ''oura'', meaning "tail", and ''lophos'', meaning "crest". In ''Urolophus'', the outer rims of the nostrils are not enlarged into lobes, but may form a small knob at the back. A fossil species, ''Urolophus crassicaudatus'', has been found in Monte Bolca, northern Italy, in deposits dating back to the late Ypresian stage of the Eocene epoch (49 Ma); however, Marramà ''et al.'' (2020) transferred this species to the genus '' Arechia''. Species There are currently 21 recognized species in this genus: * '' Urolophus aurantiacus'' J. P. Müller & Henle, 1841 (Sepia stingray) * †'' Urolophus bicuneatus'' Noetling, 1885 * '' Urolophus bucculentus'' W. J. Macleay, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Cruciatus
The crossback stingaree or banded stingaree (''Urolophus cruciatus'') is a species of stingray in the family Urolophidae. It is endemic to southeastern Australia, mainly off Victoria and Tasmania but also marginally to New South Wales and South Australia. This bottom-dwelling fish generally inhabits sand and reef habitats deeper than off Victoria, and muddy habitats in shallow bays and estuaries off Tasmania. Befitting its name, the crossback stingaree has a distinctive dark pattern on its back, consisting of a midline stripe that is crossed by three transverse bars. It has an oval pectoral fin disc with a blunt snout and a skirt-shaped curtain of skin between the nostrils. Its tail is short with no skin fold along the sides, and a deep, leaf-shaped caudal fin. The youngest rays may have a small dorsal fin in front of the stinging tail spine. This species reaches in length. During the day the crossback stingaree is usually inactive and can be found partially or completely ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Bucculentus
The sandyback stingaree or great stingaree (''Urolophus bucculentus'') is a little-known species of stingray in the family Urolophidae, endemic to southeastern Australia. It is generally found offshore around the edge of the continental shelf, at a depth of . A relatively large species reaching long, the sandyback stingaree has a diamond-shaped pectoral fin disc wider than long, usually with a dorsal pattern of numerous fine lighter marks on a yellowish to brownish background. Its short tail terminates in a deep, leaf-shaped caudal fin, and bears a sizable dorsal fin just in front of the stinging spine. A bottom-dwelling predator taking mostly crustaceans, the sandyback stingaree is aplacental viviparous: females supply their unborn young with histotroph ("uterine milk"), bearing up to five pups every other year following a 14–19-month gestation period. Significant numbers of this species are taken incidentally by commercial fisheries, primarily off New South Wales ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophidae
The Urolophidae are a family of rays in the order Myliobatiformes, commonly known as stingarees or round stingrays. This family formerly included the genera '' Urobatis'' and ''Urotrygon'' of the Americas, which are presently recognized as forming their own family Urotrygonidae. Stingarees are found in the Indo-Pacific region, with the greatest diversity off Australia. They are sluggish, bottom-dwelling fish that have been recorded from shallow waters close to shore to deep waters over the upper continental slope. Measuring between long, these rays have oval to diamond-shaped pectoral fin discs and relatively short tails that terminate in leaf-shaped caudal fins, and may also have small dorsal fins and lateral skin folds. Most are smooth-skinned, and some have ornate dorsal color patterns. Stingarees feed on or near the sea floor, consuming small invertebrates and occasionally bony fishes. They are aplacental viviparous, meaning their embryos emerge from eggs inside the uterus, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Expansus
The wide stingaree (''Urolophus expansus'') is a little-known species of stingray in the family Urolophidae, found off southwestern Australia. It typically occurs over sand in water deep around the edge of the continental shelf. This species has a broad diamond-shaped pectoral fin disc, a slightly pointed snout, and a tail with a leaf-like caudal fin, skin folds along either side, and no dorsal fins. Between its nostrils is a skirt-shaped curtain of skin. It is grayish green above, with faint bluish lines beside and behind the eyes. The maximum length on record is . The diet of the wide stingaree consists mainly of isopods and polychaete worms. It is aplacental viviparous, with the females supplying their unborn young with histotroph ("uterine milk"). This species is regularly caught incidentally by commercial trawl fisheries operating in the Great Australian Bight. Although it is unlikely to survive being captured and also tends to abort any gestating young during the pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Gigas
The spotted stingaree (''Urolophus gigas'') is an uncommon species of stingray in the family Urolophidae, endemic to shallow waters along the coast of southern Australia. It favors rocky reefs and seagrass beds. This species can be readily identified by its nearly circular, dark-colored pectoral fin disc, adorned with a complex pattern of white or cream spots. Its eastern and western forms differ slightly in coloration and have been regarded as separate species. There is a skirt-shaped curtain of skin between its nostrils. Its tail is fairly thick and terminates in a short leaf-shaped caudal fin; a relatively large dorsal fin is present just in front of the stinging spine. Rather reclusive, at least during the day, the spotted stingaree preys largely on crustaceans. It is aplacental viviparous: female bear litters of up to 13 pups and supply them with histotroph ("uterine milk") during gestation. Relatively inoffensive towards humans, the International Union for Conservation of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Flavomosaicus
The patchwork stingaree (''Urolophus flavomosaicus'') is a little-known species of stingray in the family Urolophidae, with a disjunct distribution off northwestern and northeastern Australia. It usually inhabits the outer continental shelf, at a depth of . This species has a diamond-shaped pectoral fin disc much wider than long, and a short, flattened tail with a prominent dorsal fin and leaf-like caudal fin. There is a skirt-shaped curtain of skin between its nostrils. Its dorsal color pattern resembles a mosaic of dark brown rings with light-colored centers, separated by fine reticulated lines. The International Union for Conservation of Nature (IUCN) has listed the patchwork stingaree under Least Concern, as it is subject to minimal fishing pressure. Taxonomy Peter Last and Martin Gomon described the patchwork stingaree in a 1987 issue of ''Memoirs of the National Museum of Victoria'', giving it the specific epithet ''flavomosaicus'' from the Latin ''flavus'' ("yellow") ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Aurantiacus
The sepia stingray (''Urolophus aurantiacus'') is a species of fish in the family Urolophidae. It is found in Japan, Taiwan, Vietnam, possibly North Korea, and possibly South Korea. It is threatened by habitat loss Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby .... References External links Fishes of Australia : ''Urolophus aurantiacus'' sepia stingray East China Sea Marine fauna of East Asia Taxa named by Johannes Peter Müller Taxa named by Friedrich Gustav Jakob Henle sepia stingray Taxonomy articles created by Polbot {{Rajiformes-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Deforgesi
The Chesterfield Island stingaree or Deforge's stingaree (''Urolophus deforgesi'') is a little-known species of stingray in the family Urolophidae, endemic to the continental slope off the Chesterfield Islands. Reaching long, it has a rounded, diamond-shaped pectoral fin disc colored plain brown above and pale below, with a short head. There is a narrow, skirt-shaped curtain of skin between its nostrils. Its tail is relatively long and terminates in a leaf-shaped caudal fin; there are no dorsal fin or lateral skin folds. This species has been listed under Least Concern by the International Union for Conservation of Nature (IUCN), as there is little fishing activity within its range. Taxonomy The first known specimens of the Chesterfield Island stingaree were caught during a series of research cruises undertaken in the Coral Sea by France and Australia in the 1990s. The species was described by Bernard Séret and Peter Last in a 2003 issue of the scientific journal ''Cybium'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Circularis
The circular stingaree (''Urolophus circularis'') is an uncommon, little-known species of stingray in the family Urolophidae. Endemic to the coastal waters of southwestern Australia, it prefers a rocky and/or vegetated habitat. Reaching in length, this species is characterized by an oval pectoral fin disc bearing a striking dorsal pattern of lighter spots and rings, and a central circle of white-margined black spots, on a bluish gray background. Between its nostrils is a skirt-shaped curtain of skin, with the posterior corners drawn out into lobes. Its tail bears a rather large dorsal fin in front of the stinging spine, and ends in a deep, lance-like caudal fin. Negligibly affected by human activity, the circular stingaree has been listed under Least Concern by the International Union for Conservation of Nature (IUCN). Taxonomy The first known specimen of the circular stingaree was collected off Carnac Island, near Fremantle, Western Australia. Australian ichthyologist Rola ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urolophus Javanicus
The Java stingaree (''Urolophus javanicus'') is a species of stingray in the family Urolophidae, known only from a single female specimen long caught off Jakarta, Indonesia. This species is characterized by an oval-shaped pectoral fin disc longer than wide, and a tail with a dorsal fin in front of the stinging spine and a caudal fin. It is brown above, with darker and lighter spots. The International Union for Conservation of Nature has listed the Java stingaree as critically endangered; it has not been recorded since its discovery over 150 years ago, and its range is subject to heavy fishing pressure and habitat degradation. Taxonomy In July 1862, German zoologist Eduard von Martens purchased the sole known specimen of the Java stingaree at a fish market in Jakarta. He described it as ''Trygonoptera javanica'' in an 1864 volume of the scientific journal ''Monatsberichte der Akademie der Wissenschaft zu Berlin'' (''Monthly Report of the Academy of Sciences, Berlin''). Subsequ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geologic Time Scale
The geologic time scale, or geological time scale, (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (scientific branch of geology that aims to determine the age of rocks). It is used primarily by Earth scientists (including geologists, paleontologists, geophysicists, geochemists, and paleoclimatologists) to describe the timing and relationships of events in geologic history. The time scale has been developed through the study of rock layers and the observation of their relationships and identifying features such as lithologies, paleomagnetic properties, and fossils. The definition of standardized international units of geologic time is the responsibility of the International Commission on Stratigraphy (ICS), a constituent body of the International Union of Geological Sciences (IUGS), whose primary objective is to precisely define ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
