|
Guitarfish
The guitarfish, also referred to as shovelnose rays, are a family, Rhinobatidae, of rays. The guitarfish are known for an elongated body with a flattened head and trunk and small, ray-like wings. The combined range of the various species is tropical, subtropical, and warm temperate waters worldwide. Names In Australia and New Zealand, guitarfish are commonly referred to as shovelnose rays or shovelnose sharks. Description Guitarfish have a body form intermediate between those of sharks and rays. The tail has a typical shark-like form, but in many species, the head has a triangular, or guitar-like shape, rather than the disc-shape formed by fusion with the pectoral fins found in other rays. Reproduction Guitarfish can be ovoviviparous; the embryo matures inside an egg within the mother until it is ready to hatch. This is typical of rays. Habitat Guitarfish are bottom feeders that bury themselves in mud or sand and eat worms, crabs, and clams. Some can tolerate salt, fresh, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shovelnose Guitarfish
The shovelnose guitarfish (''Pseudobatos productus'') is a ray in the family Rhinobatidae. ''P. productus'' was first described by ichthyologist William Orville Ayre in 1854 as ''Rhinobatos productus'', with the genus derived from the Greek word rhinos, meaning nose, and the Latin word batis, meaning ray. It was later placed in the genus ''Pseudobatos'' following reconsideration of many species placed in '' Rhinobatos''. As its common name suggests, this species possesses a pointed shovel-shaped snout and a body similar to that of a guitar with a larger head and long, slender body. The shovelnose is considered to be a primitively developed ray, with many features of both sharks and rays. The shovelnose guitarfish was first considered to be a shark because of its dorsal fins' shape. Fossils of ''P. productus'' ancestors have been recovered, dating back over 100 million years. Description The coloration of this species ranges from olive to sandy brown which aids in the species' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhinobatos
''Rhinobatos'' is a genus of fish in the Rhinobatidae family. Although previously used to encompass all guitarfishes, it was found to be polyphyletic, and recent authorities have transferred many species included in the genus to ''Acroteriobatus'', '' Glaucostegus'', and ''Pseudobatos''. Species The 20 currently recognized species in this genus are: * '' Rhinobatos albomaculatus'' Norman, 1930 (White-spotted guitarfish) * '' Rhinobatos annandalei'' Norman, 1926 (Annandale's guitarfish) * '' Rhinobatos austini'' Ebert & Gon, 2017 (Austin’s guitarfish) * '' Rhinobatos borneensis'' Last, Séret & Naylor, 2016 (Borneo guitarfish) * '' Rhinobatos formosensis'' Norman, 1926 (Taiwan guitarfish) * '' Rhinobatos holcorhynchus'' Norman, 1922 (Slender guitarfish) * '' Rhinobatos hynnicephalus'' J. Richardson, 1846 (Ringstreaked guitarfish) * '' Rhinobatos irvinei'' Norman, 1931 (Spineback guitarfish) * '' Rhinobatos jimbaranensis'' Last, W. T. White & Fahmi, 2006 (Jimbaran shovelnose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Acroteriobatus
''Acroteriobatus'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to '' Rhinobatos'', recent authors treat it as distinct. They are found near the shore off southern Africa and in the northwestern Indian Ocean. They are brownish above, often with a spotted pattern, and reach up to depending on the exact species. Species There are eight currently recognized species in this genus: * '' Acroteriobatus andysabini'' (2021) (Malagasy blue-spotted guitarfish) * '' Acroteriobatus annulatus'' ( J. P. Müller & Henle, 1841) (Lesser guitarfish) * '' Acroteriobatus blochii'' ( J. P. Müller & Henle, 1841) (Bluntnose guitarfish) * '' Acroteriobatus leucospilus'' (Norman, 1926) (Grayspotted guitarfish) * '' Acroteriobatus ocellatus'' (Norman, 1926) (Speckled guitarfish) * '' Acroteriobatus omanensis'' Last, Hendeson & Naylor, 2016 (Oman guitarfish) * '' Acroteriobatus salalah'' ( J. E. Randall & Compagno, 1995) (Salalah guitarfish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pseudobatos
''Pseudobatos'' is a genus of fish in the Rhinobatidae family. Although its constituent species were previously assigned to ''Rhinobatos'', recent authors treat it as distinct. They are found in warmer coastal parts of the Americas, ranging from northern Chile to California (USA) on the Pacific side, and from northeastern Argentina to North Carolina (USA) on the Atlantic side. They are brownish or grayish above, and reach up to depending on the exact species. Species There are nine currently recognized species in this genus: * ''Pseudobatos buthi'' K.M. Rutledge, 2019 (spadenose guitarfish) * ''Pseudobatos glaucostigmus'' (David Starr Jordan, D. S. Jordan & Charles Henry Gilbert, C. H. Gilbert, 1883) (speckled guitarfish) * ''Pseudobatos horkelii'' (Johannes Peter Müller, J. P. Müller & Friedrich Gustav Jakob Henle, Henle, 1841) (Brazilian guitarfish) * ''Pseudobatos lentiginosus'' (Samuel Garman, Garman, 1880) (Atlantic guitarfish) * ''Pseudobatos leucorhynchus'' (Albert Gü ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ray (fish)
Batomorphi is a division of cartilaginous fishes, commonly known as rays, this taxon is also known as the 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 of the head. Most batomorphs have a flat, ... [...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] |
Sawfish
Sawfish, also known as carpenter sharks, are a family of very large 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. All species are critically 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 th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myledaphus
''Myledaphus'' is an extinct genus of guitarfish. It currently contains four valid species found in North America (''M. bipartitus'', ''M. pustulosus''), South America (''M. araucanus''), and Central Asia (''M. tritus''). It is confirmed to have lived during the Late Cretaceous, with possible occurrences in the Paleocene and early Eocene. While the genus is mostly known from teeth, two partial skeletons of ''M. bipartitus'' have been found in the Dinosaur Park Formation of Alberta. Biology ''Myledaphus'' remains have been found both in marine and fluvial (freshwater) deposits, suggesting it could tolerate a range of salinity.Hoffman, Brian L. et al. “Dental Structure of the Late Cretaceous (Maastrichtian) Guitarfish (Neoselachii: Batoidea) Myledaphus pustulosus from the Hell Creek Formation of Garfield County, Montana.” ''Transactions of the Kansas Academy of Science'' 121 (2018): 279 - 296. This genus was able to move into the North American continent due to an interconti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cartilaginous Fish
Chondrichthyes (; ) is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fish'', which have skeletons primarily composed of bone tissue. Chondrichthyes are aquatic vertebrates with paired fins, paired nares, placoid scales, conus arteriosus in the heart, and a lack of opercula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates. The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates and sawfish) and Holocephali ( chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Extant chondrichthyans range in size from the finless sleeper ray to the over whale shark. Anatomy Skeleton The skeleton is cartilaginous. The notochord is gradually replaced by a vertebral column during development, e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chondrichthyan
Chondrichthyes (; ) is a class (biology), class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fish'', which have skeletons primarily composed of bone tissue. Chondrichthyes are aquatic animal, aquatic vertebrates with paired fins, paired Nostril, nares, placoid scales, conus arteriosus in the heart, and a lack of operculum (fish), opercula and swim bladders. Within the infraphylum Gnathostomata, cartilaginous fishes are distinct from all other jawed vertebrates. The class is divided into two subclasses: Elasmobranchii (sharks, Batoidea, rays, skate (fish), skates and sawfish) and Holocephali (chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Extant chondrichthyans range in size from the finless sleeper ray to the over whale shark. Anatomy Skeleton The skeleton is cartilaginous. The notochord is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. The Jurassic constitutes the second and middle period of the Mesozoic, Mesozoic Era as well as the eighth period of the Phanerozoic, Phanerozoic Eon and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic magmatic province, Central Atlantic Magmatic Province (CAMP). The beginning of the Toarcian Age started around 183 million years ago and is marked by the Toarcian Oceanic Anoxic Event, a global episode of Anoxic event, oceanic anoxia, ocean acidification, and elevated global temperatures associated with extinctions, likely caused by the eruption of the Kar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aptychotrema
''Aptychotrema'' is a genus of guitarfish which belongs to the family Trygonorrhinidae. They were formerly classified in the family Rhinobatidae. They are found off the coast of Australia. Species There are three living species, and one extinct species only known from fossil remains of Cenomanian age.Bernárdez, E. (2002). Los dientes de seláceos del Cretácico de la depresión central asturiana. Univ. d'Oviedo: 1–476. * †'' Aptychotrema massoniae'' Bernardez, 2002 * '' Aptychotrema rostrata'' Shaw, 1794 (Eastern shovelnose ray or Short-snouted shovelnose ray) - synonym: ''Aptychotrema bougainvillii'' J. P. Müller & Henle, 841 * '' Aptychotrema timorensis'' Last A last is a mechanical form shaped like a human foot. It is used by shoemakers and cordwainers in the manufacture and repair of shoes. Lasts come in many styles and sizes, depending on the exact job they are designed for. Common variations ..., 2004 (Spotted shovelnose ray) * '' Aptychotrema vincentian ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
