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Sawfish
Sawfish, also known as carpenter sharks, are a family of rays characterized by a long, narrow, flattened rostrum, or nose extension, lined with sharp transverse teeth, arranged in a way that resembles a saw. They are among the largest fish with some species reaching lengths of about . They are found worldwide in tropical and subtropical regions in coastal marine and brackish estuarine waters, as well as freshwater rivers and lakes. They are endangered. They should not be confused with sawsharks (order Pristiophoriformes) or the extinct 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 captured with the use of their saw. They are generally harmless to humans, but can inflict serious injuries with the saw when captured and defend ... [...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, 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 and g ... [...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 t ... [...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 resemble 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 has a narrower rostral ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pristis
''Pristis'' is a genus of sawfish of the family Pristidae. These large fish are found worldwide in tropical and subtropical regions in coastal marine waters, estuaries, and 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'' Garman, 1906 — dwarf sawfish, Queensland sawfish * '' Pristis pectinata'' Latham, 1794 — smalltooth sawfish * '' Pristis pristis'' (Linnaeus, 1758) — largetooth sawfish, common sawfish, freshwater sawfish, Leichhardt's sawfish * '' Pristis zijsron'' Bleeker, 1851 — longcomb sawfish, green sawfish These are divided into two species groups. Most are considered a part of the smalltooth group, except ''P. pristis'' which is the sole member of the largetooth group.Faria, V. V.; McDavitt, M. T.; Charvet, P.; Wiley ... [...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 (anatomy), 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batoidea
Batoidea is a superorder of cartilaginous fishes, commonly known as rays. They and their close relatives, the sharks, comprise 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 Batoids are flat-bodied, and, like sharks, are cartilaginous fish, meaning they have a boneless skeleton made of a tough, elastic cartilage. Most batoids have five ventral slot-like body openings called gill slits that lead from the gills, but the Hexatrygonidae have six. Batoid gill slits lie under the pectoral fins on the underside, whereas a shark's are on the sides of the head. Most batoids have a flat, disk-like body, with the exception of the guitarfishes and sawfishes, while most sharks have a spindle-shaped body. Many species of batoid have developed their pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Largest Fish
Fish vary greatly in size. The whale shark and basking shark exceed all other fish by a considerable margin in weight and length. Fish are a paraphyletic group that describes aquatic vertebrates while excluding tetrapods, and the bony fish that often represent the group are more closely related to cetaceans such as whales, than to the cartilaginous fish such as sharks and rays. As such, cross group comparisons on this page only serve a colloquial purpose. Largest extant fish Jawless fish (Agnatha) * Hagfish ( Myxini) :The hagfish, which are not taxonomically true fish, are among the most primitive extant vertebrates. There is only one order and family in this animal class. All of the 77 known species have elongated, eel-like bodies but can be distinguished by their downward-facing mouths. The largest form is the Goliath hagfish (''Eptatretus goliath''). This species can range up to in length and weigh to . * Lampreys (Petromyzontiformes) :As with the hagfish, lamprey ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sclerorhynchoidei
Sclerorhynchoidei is an extinct suborder of rajiform rays that had long rostra with large denticles similar to sawfishes and sawsharks. This feature was convergently evolved and their closest living relatives are actually skates. While they are often called "sawfishes", sawskates is a more accurate common name for sclerorhynchoids. The suborder contains five named families: Ganopristidae, Ischyrhizidae, 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 reworked specimens. Phylogeny Below is a cladogram of Sclerorhynchoidei, with the topology based on Villalobos-Segura ''et al.'' (2021b) and the family taxonomy based on Greenfield (2021). Other genera *†''Agaleorhynchus'' *†''Ankistrorhynchus'' *†''Arc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Propristis
''Propristis'' is an extinct genus of sawfish that lived from the Eocene to the Miocene. It contains two valid species, ''P. schweinfurthi'' and ''P. mayumbensis''. It has been found in Egypt, Cabinda, Morocco, Qatar, Spain, the United Kingdom, and the United States. Isolated rostral denticles are the most common remains, but rostra The rostra ( it, Rostri, links=no) was a large platform built in the city of Rome that stood during the republican and imperial periods. Speakers would stand on the rostra and face the north side of the comitium towards the senate house and de ... have also been found. References {{Taxonbar, from=Q111593411 Prehistoric fish genera Pristidae Species described in 1883 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rostrum (anatomy)
Rostrum (from Latin ', meaning ''beak'') is a term used in anatomy for a number of phylogenetically unrelated structures in different groups of animals. Invertebrates * In crustaceans, the rostrum is the forward extension of the carapace in front of the eyes. It is generally a rigid structure, but can be connected by a hinged joint, as seen in Leptostraca. * Among insects, the rostrum is the name for the piercing mouthparts of the order Hemiptera as well as those of the snow scorpionflies, among many others. The long snout of weevils is also called a rostrum. * Gastropod molluscs have a rostrum or proboscis. * Cephalopod molluscs have hard beak-like mouthparts referred to as the rostrum. File:Washington DC Zoo - Macrobrachium rosenbergii 6.jpg, Crustacean: the rostrum of the shrimp ''Macrobrachium rosenbergii'' is serrated along both edges. File:Gminatus australis with Beetle.jpg, Insect: assassin bug piercing its prey with its rostrum File:Architeuthis beak.jpg, Cephalopod: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Endangered Species
An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and invasive species. The International Union for Conservation of Nature (IUCN) Red List lists the global conservation status of many species, and various other agencies assess the status of species within particular areas. Many nations have laws that protect conservation-reliant species which, for example, forbid hunting, restrict land development, or create protected areas. Some endangered species are the target of extensive conservation efforts such as captive breeding and habitat restoration. Human activity is a significant cause in causing some species to become endangered. Conservation status The conservation status of a species indicates the likelihood that it will become extinct. Multiple factors are considered when assessing the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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