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Odontaspis
''Odontaspis'' (from 'tooth') and 'shield') is a genus of sand shark with two extant species. Description Bigeye sand tigers can reach a length of about and smalltooth sand tigers of about 4.1 m. They are large-bodied sharks with long, conical snouts, broad-based dorsal and anal fins, and an asymmetrical caudal fin with a strong lower lobe. Their teeth are large, with prominent narrow cusps. They are distinguished from the similar genus '' Carcharias'' by the absence of crushing posterior teeth.Bourdon, J''Odontaspis'' Agassiz 1838 ''Elasmo.com''. Retrieved on December 24, 2008. These bottom dwelling, deepwater sharks can be found in temperate and tropical waters of all the oceans. Extant species * '' Odontaspis ferox'' ( A. Risso, 1810) (smalltooth sand tiger) * '' Odontaspis noronhai'' ( Maul, 1955) (bigeye sand tiger) Extinct species Extinct species within this genus include: * ''Odontaspis aculeatus'' Capetta & Case, 1975 * ''Odontaspis speyeri'' (Dartevel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Smalltooth Sand Tiger
The smalltooth sand tiger or bumpytail ragged-tooth (''Odontaspis ferox'') is a species of Lamniformes, mackerel shark in the family (biology), family Sand shark, Odontaspididae, with a patchy but worldwide distribution in tropical and warm temperate waters. They usually inhabit deepwater rocky habitats, though they are occasionally encountered in shallow water, and have been known to return to the same location year after year. This rare species is often mistaken for the much more common sand tiger shark (''Carcharias taurus''), from which it can be distinguished by its first dorsal fin, which is larger than the second and placed further forward. It grows to at least in length. They have also been recently sighted in Irish and English waters. Very little is known of the biology and behavior of the smalltooth sand tiger. It is an active predator of benthic bony fishes, invertebrates, and cartilaginous fishes. This species is thought to be ovoviviparous with oophagy, oophagous em ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bigeye Sand Tiger
The bigeye sand tiger (''Odontaspis noronhai'') is an extremely rare species of Lamniformes, mackerel shark in the family (biology), family Sand shark, Odontaspididae, with a possible worldwide distribution. A large, bulky species reaching at least in length, the bigeye sand tiger has a long bulbous snout, large orange eyes without nictitating membranes, and a capacious mouth with the narrow teeth prominently exposed. It can be distinguished from the similar smalltooth sand tiger (''O. ferox'') by its teeth, which have only one lateral cusplet on each side, and by its uniformly dark brown color. Inhabiting continental margins and oceanic waters at depths of , the bigeye sand tiger may make diel vertical migration, vertical and fish migration, horizontal migratory movements. It feeds on bony fishes and squid, and its sizable eyes and dark coloration suggest that it may spend most of its time in the mesopelagic zone. Reproduction is probably viviparous with oophagy, oophagous embry ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Odontaspis
''Odontaspis'' (from 'tooth') and 'shield') is a genus of sand shark with two extant species. Description Bigeye sand tigers can reach a length of about and smalltooth sand tigers of about 4.1 m. They are large-bodied sharks with long, conical snouts, broad-based dorsal and anal fins, and an asymmetrical caudal fin with a strong lower lobe. Their teeth are large, with prominent narrow cusps. They are distinguished from the similar genus '' Carcharias'' by the absence of crushing posterior teeth.Bourdon, J''Odontaspis'' Agassiz 1838 ''Elasmo.com''. Retrieved on December 24, 2008. These bottom dwelling, deepwater sharks can be found in temperate and tropical waters of all the oceans. Extant species * '' Odontaspis ferox'' ( A. Risso, 1810) (smalltooth sand tiger) * '' Odontaspis noronhai'' ( Maul, 1955) (bigeye sand tiger) Extinct species Extinct species within this genus include: * ''Odontaspis aculeatus'' Capetta & Case, 1975 * ''Odontaspis speyeri'' (Dartevel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Prehistoric Cartilaginous Fish
This list of prehistoric cartilaginous fish genera is an attempt to create a comprehensive listing of all Genus, genera that have ever been included in the class chondrichthyes ''and'' are known from the fossil record. This list excludes purely vernacular terms, genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered to be cartilaginous fish. It includes all commonly accepted genera. This list currently contains 804 generic names. * Extinction, Extinct genera are marked by a dagger (†). * Extant taxon genera are bolded. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include: * Synonym (zoology), Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carcharias
''Carcharias'', also known as sand tiger sharks, is a genus of mackerel sharks belonging to the family Carchariidae, of which it is the only extant member. Once bearing many prehistoric species, all have gone extinct with the exception of the critically endangered sand tiger shark Description ''Carcharias'' are long on average. The maximum weight of the shark is . Differentiating species of sharks is usually done by locating and measuring their fins. The tail is one third of the entire body size. The second dorsal fin and the anal fin of ''Carcharias'' are very large and about equal in size. The pectoral fins are triangular and only slightly larger than the dorsal fins. The teeth are very long and narrow with sharp points, and smooth with no ridges. Diet ''Carcharias'' species are generalist predators that hunt bony fish, small sharks, rays, squids, crabs and lobsters. Habitat Sand tiger sharks are found in the Pacific, Atlantic and Indian oceans. They live in water depths ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shark Genera
Sharks are a group of elasmobranch cartilaginous fish characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the division Selachii and are the sister group to the Batomorphi ( rays and skates). Some sources extend the term "shark" as an informal category including extinct members of Chondrichthyes (cartilaginous fish) with a shark-like morphology, such as hybodonts. Shark-like chondrichthyans such as ''Cladoselache'' and ''Doliodus'' first appeared in the Devonian Period (419–359 million years), though some fossilized chondrichthyan-like scales are as old as the Ordovician, Late Ordovician (458–444 million years ago). The earliest confirmed modern sharks (Selachii) are known from the Early Jurassic around , with the oldest known member being ''Agaleus'', though records of true sharks may extend back as far as the Permian. Sharks range in size ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extant Cretaceous First Appearances
Extant or Least-concern species, least concern is the opposite of the word extinct. It may refer to: * Extant hereditary titles * Extant literature, surviving literature, such as ''Beowulf'', the oldest extant manuscript written in English * Extant taxon, a taxon which is not extinct, such as an extant species * Extant Theatre Company, a disability arts organisation * Extant (TV series), ''Extant'' (TV series), an American television series * Hank Hall, also known as Extant, a DC Comics supervillain See also * Extent (other) {{disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaternary
The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS), as well as the current and most recent of the twelve periods of the Phanerozoic eon. It follows the Neogene Period and spans from 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today); a proposed third epoch, the Anthropocene, was rejected in 2024 by IUGS, the governing body of the ICS. The Quaternary is typically defined by the Quaternary glaciation, the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused. Research history In 1759 Giovanni Arduino proposed that the geological strata of northern Italy could be divided into four succ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Günther Maul
Günther Edmund Maul (May 7, 1909 – September 28, 1997) was a German ichthyologist and taxidermist in Portugal. Maul came to Madeira in December 1930 to work as taxidermist at Museu Municipal do Funchal, which opened to the public in 1933. He was appointed director for the museum in 1940, a post that he held to his retirement in 1979. He, however, continued his research until shortly before his death. He started two journals (''Boletim do Museu Municipal do Funchal'' in 1945 and ''Bocagiana'' in 1959) and opened the museum's aquarium to the public in 1959. He also participated in several expeditions including with the French bathyscaphe '' Archimède'' in 1966 and organised the first multidisciplinary expedition to the Salvage Islands in 1963. He was awarded an honorary doctorate from the University of Madeira in 1995. Works He described several species of fish *'' Himantolophus albinares'' *'' Coryphaenoides thelestomus'' *'' Macruronus maderensis'' *'' Rouleina maderensis'' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
