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Sawfishes
Sawfish, also known as carpenter sharks, are a Family (biology), family of very large batoidea, rays characterized by a long, narrow, flattened rostrum (anatomy), rostrum, or nose extension, lined with sharp transverse plane, transverse teeth, arranged in a way that resembles a saw. They are among the List of largest fish, largest fish, with some species reaching lengths of about . They are found worldwide in tropical and subtropical regions in coastal Seawater, marine and brackish estuarine waters, as well as freshwater rivers and lakes. All species are critically endangered. They should not be confused with sawsharks (order Pristiophoriformes) or the extinct Sclerorhynchoidei, sclerorhynchoids (order Rajiformes) which have a similar appearance, or swordfish (family Xiphiidae) which have a similar name but a very different appearance. Sawfishes are relatively slow breeders and the females give birth to live young. They feed on fish and invertebrates that are detected and capt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batoidea
Batomorphi is a Division (taxonomy), division of Chondrichthyes, cartilaginous fishes, commonly known as rays, this taxon is also known as the Order (biology), superorder Batoidea, but the 5th edition of ''Fishes of the World'' classifies it as the division Batomorphi. They and their close relatives, the sharks, compose the subclass Elasmobranchii. Rays are the largest group of cartilaginous fishes, with well over 600 species in 26 families. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed on their ventral surfaces. Anatomy Batomorphs are flat-bodied, and, like sharks, are cartilaginous fish, meaning they have a boneless skeleton made of a tough, elastic cartilage. Most batomorphs have five ventral slot-like body openings called gill slits that lead from the gills, but the Hexatrygonidae have six. Batomorph gill slits lie under the pectoral fins on the underside, whereas a shark's are on the sides ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Largetooth Sawfish
The largetooth sawfish (''Pristis pristis'', syn. ''P. microdon'' and ''P. perotteti'') is a species of sawfish in the family Pristidae. It is found worldwide in tropical and subtropical coastal regions, but also enters freshwater. It has declined drastically and is now critically endangered. A range of English names have been used for the species, or populations now part of the species, including common sawfish (despite it being far from common today), wide sawfish, freshwater sawfish, river sawfish (less frequently, other sawfish species also occur in freshwater and rivers), Leichhardt's sawfish (after explorer and naturalist Ludwig Leichhardt) and northern sawfish. Taxonomy The taxonomy of ''Pristis pristis'' in relations to ''P. microdon'' (claimed range: Indo-West Pacific) and ''P. perotteti'' (claimed range: Atlantic and East Pacific) has historically caused considerable confusion, but evidence published in 2013 revealed that the three are conspecific, as morphological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sclerorhynchoidei
Sclerorhynchoidei is an extinct suborder of Rajiformes, rajiform Batoidea, rays that had long Rostrum (anatomy)#Vertebrates, rostra with large Fish scale#Placoid scales, denticles similar to Sawfish, sawfishes and Sawshark, sawsharks. This feature was convergent evolution, convergently evolved, recently proposed as 'pristification', and their closest living relatives are actually Skate (fish), skates. While they are often called "sawfishes", sawskates is a more accurate common name proposed in 2021 for sclerorhynchoids, which has been subsequently used by other researchers. The suborder contains five named families: Ganopristidae, Ischyrhiza, Ischyrhizidae, Onchopristis, Onchopristidae, Ptychotrygonidae, and Schizorhizidae. Several genera (see below) are not currently placed in any of these families. Sclerorhynchoids first appeared in the Barremian and went extinct during the Cretaceous–Paleogene extinction event, with former Paleocene occurrences being misidentifications or Fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Green Sawfish
The longcomb sawfish, narrowsnout sawfish or green sawfish (''Pristis zijsron'') is a species of sawfish in the family Pristidae, found in tropical and subtropical waters of the Indo-West Pacific. It has declined drastically and is now considered a critically endangered species. Description The longcomb sawfish is possibly the largest species of sawfish, reaching a total length of up to , but rarely more than today. Its upperparts are greenish-brown to olive, while the underparts are whitish. A combination of characters are necessary to distinguish it from the other sawfish species: the longcomb sawfish has teeth to near the base of the rostrum or "saw" (unlike the knifetooth sawfish, ''Anoxypristis cuspidata''), 23–37 teeth on each side of the rostrum (18–24 in the dwarf sawfish, ''P. clavata'', 20–32 in smalltooth sawfish, ''P. pectinata'', and 14–24 in largetooth sawfish, ''P. pristis''), the teeth towards the tip of the rostrum are clearly closer to each other tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sawshark
A sawshark or saw shark is a member of a shark order (Pristiophoriformes ) bearing a unique long, saw-like rostrum (snout or bill) edged with sharp teeth, which they use to slash and disable their prey. There are eight species within the Pristiophoriformes, including the longnose or common sawshark ('' Pristiophorus cirratus''), shortnose sawshark ('' Pristiophorus nudipinnis''), Japanese sawshark ('' Pristiophorus japonicas''), Bahamas sawshark ('' Pristiophorus schroederi''), sixgill sawshark ('' Pliotrema warreni''), African dwarf sawshark ('' Pristiophorus nancyae''), Lana's sawshark ('' Pristiophorus lanae'') and the tropical sawshark ('' Pristiophorus delicatus''). Sawsharks are found in many areas around the world, most commonly in waters from the Indian Ocean to the southern Pacific Ocean. They are normally found at depths around 40–100 m, but can be found much lower in tropical regions. The Bahamas sawshark was discovered in deeper waters (640 m to 915 m) of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pristis
''Pristis'' is a genus of sawfish of the family (biology), family Pristidae. These large fish are found worldwide in tropical and subtropical regions in coastal marine waters, estuaries, and Fresh water, freshwater lakes and rivers. Sawfish have declined drastically and all species are considered critically endangered today. Taxonomy The scientific genus name ''Pristis'' is derived from the Greek word for saw. Living species Recent authorities recognize four species: * ''Pristis clavata'' Samuel Garman, Garman, 1906 — dwarf sawfish, Queensland sawfish * ''Pristis pectinata'' John Latham (ornithologist), Latham, 1794 — smalltooth sawfish * ''Pristis pristis'' (Carl Linnaeus, Linnaeus, 10th edition of Systema Naturae, 1758) — largetooth sawfish, common sawfish, freshwater sawfish, Leichhardt's sawfish * ''Pristis zijsron'' Pieter Bleeker, Bleeker, 1851 — longcomb sawfish, green sawfish These are divided into two Species complex, species groups. Most are considered a pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anoxypristis
The narrow sawfish (''Anoxypristis cuspidata''), also known as the pointed sawfish or knifetooth sawfish, is a species of sawfish in the family Pristidae, part of the Batoidea, a superorder of cartilaginous fish that include the rays and skates. Sawfish display a circumglobal distribution in warm marine and freshwater habitats. Their extant biodiversity is limited to five species belonging to two genera (''Pristis'' and ''Anoxypristis''). The sawfishes are characterised by the long, narrow, flattened rostrum or extension on their snout. This is lined with sharp transverse teeth, arranged in a way that resembles the teeth of a saw and are used for killing prey. It is found in the shallow coastal waters and estuaries of the Indo-West Pacific, ranging from the Persian Gulf to southern Japan, Papua New Guinea and northern Australia. It is the only living member of the genus ''Anoxypristis'', but was previously included in the genus ''Pristis''. Compared to ''Pristis'', ''Anoxypristis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swordfish
The swordfish (''Xiphias gladius''), also known as the broadbill in some countries, are large, highly migratory predatory fish characterized by a long, flat, pointed bill. They are the sole member of the Family (biology), family Xiphiidae. They are a popular sport fish of the billfish category. Swordfish are elongated, round-bodied, and lose all teeth and scales by adulthood. These fish are found widely in tropical and temperate parts of the Atlantic, Pacific, and Indian Oceans, and can typically be found from near the surface to a depth of , and exceptionally up to depths of 2,234 m. They commonly reach in length, and the maximum reported is in length and in weight. Taxonomy and etymology The swordfish is named after its long pointed, flat bill, which resembles a sword. The species name, ''Xiphias gladius'', derives from Greek Language, Greek (''xiphias'', "swordfish"), itself from (''xiphos'', "sword") and from Latin language, Latin ("sword"). This makes it superficial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mythological
Myth is a genre of folklore consisting primarily of narratives that play a fundamental role in a society. For scholars, this is very different from the vernacular usage of the term "myth" that refers to a belief that is not true. Instead, the veracity of a myth is not a defining criterion. Myths are often endorsed by religious (when they are closely linked to religion or spirituality) and secular authorities. Many societies group their myths, legends, and history together, considering myths and legends to be factual accounts of their remote past. In particular, creation myths take place in a primordial age when the world had not achieved its later form. Origin myths explain how a society's customs, institutions, and taboos were established and sanctified. National myths are narratives about a nation's past that symbolize the nation's values. There is a complex relationship between recital of myths and the enactment of rituals. Etymology The word "myth" comes from Ancient ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northern Australia
The unofficial geographic term Northern Australia includes those parts of Queensland and Western Australia north of latitude 26th parallel south, 26° and all of the Northern Territory. Those local government areas of Western Australia and Queensland that lie partially in the north are included. Also included in Northern Australia are the territories of Cocos (Keeling) Islands and Christmas Island. Although it comprises 45% of the total area of Australia, Northern Australia has only 5% of the Australian population (1.3 million in 2019). However, it includes several sources of Australian exports, being coal from the Great Dividing Range in Queensland/New South Wales and the natural gas and iron ore of the Pilbara region in WA. It also includes major natural tourist attractions, such as Uluru (Ayers Rock), the Great Barrier Reef and the Kakadu National Park. Geography and climate Almost all of Northern Australia is a huge ancient craton that has not experienced geological ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extinct (fossil) Species
Extinction is the termination of an organism by the death of its last member. A taxon may become functionally extinct before the death of its last member if it loses the capacity to reproduce and recover. As a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence. Over five billion species are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryotes globally, possibly many times more if microorganisms are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, and mammoths. Through evolution, species arise through the process of speciation. Species become extinct when they are no longer able to survive in changing conditions or against superior ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Florida
Florida ( ; ) is a U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders the Gulf of Mexico to the west, Alabama to the northwest, Georgia (U.S. state), Georgia to the north, the Atlantic Ocean to the east, the Straits of Florida to the south, and The Bahamas to the southeast. About two-thirds of Florida occupies a peninsula between the Gulf of Mexico and the Atlantic Ocean. It has the List of U.S. states by coastline, longest coastline in the contiguous United States, spanning approximately , not including its many barrier islands. It is the only state that borders both the Gulf of Mexico and the Atlantic Ocean. With a population of over 23 million, it is the List of U.S. states and territories by population, third-most populous state in the United States and ranks List of states and territories of the United States by population density, seventh in population density as of 2020. Florida spans , ranking List of U.S. states ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
