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Dykeius
''Dykeius'' is an extinct genus of large shark in the family Chlamydoselachidae. It contains a single known species, ''D. garethi'', from the Late Cretaceous Northumberland Formation of Canada. The genus and species names honor paleontologist Gareth J. Dyke. It was a gigantic relative of the modern frilled shark (genus ''Chlamydoselachus''). The teeth are much larger than those of any other known chlamydoselachid species, and comparison with modern frilled sharks estimates a total body size of at least . As with modern frilled sharks, it appears to have inhabited a deepwater environment. It is one of several giant frilled sharks known from the Late Cretaceous, along with '' Rolfodon goliath'' and undescribed taxa known from teeth, suggesting that such large sharks were not uncommon. It may have been specialized to hunt large cephalopods such as certain belemnites and ammonites Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlamydoselachidae
Chlamydoselachidae is a family of primitive deep-sea sharks in the order Hexanchiformes. They are one of only two extant families in the order alongside the cow sharks in the family Hexanchidae, and the only members of the suborder Chlamydoselachoidei. They are now represented only by two extant species in the genus '' Chlamydoselachus'': the frilled shark (''C. anguineus'') and the Southern African frilled shark (''C. africana''). However, they are thought to have been more diverse during the Late Cretaceous, where all three extant and extinct genera are known, and one other genus (''Rolfodon'') survived up to the Pliocene. The earliest remains of the family are indeterminate teeth from the Turonian of Japan. Members of this family appear to have always been closely associated with deep-sea habitats. Some extinct taxa such as ''Rolfodon goliath'' and ''Dykeius'' could grow to very large sizes. Species The following taxa are known: * '' Chlamydoselachus'' Garman, 1884 ** ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northumberland Formation
The Northumberland Formation is a Late Cretaceous (?Campanian-?Maastrichtian)-aged geologic Formation (geology), formation in Canada. It belongs to the larger Nanaimo Group. Indeterminate bird and pterosaur fossils have been recovered from the formation, as well as a potential Gladius (cephalopod), gladius of ''Eromangateuthis''. An extensive diversity of Shark tooth, shark teeth is known from the formation; many appear to be closely allied with modern deep-water shark taxa, suggesting a deep-water environment for the formation. The most well-known exposures of the formation are on Hornby Island. Vertebrate paleofauna Cartilaginous fish Source: Hybodontiformes Hexanchiformes Echinorhiniformes Squaliformes Pristiophoriformes Orectolobiformes Lamniformes Synechodontiformes Carcharhiniformes Bony fish Birds Pterosaurs Squamates Invertebrate paleofauna Molluscs Cephalopods Gastropods Crustaceans Paleoflora G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Campanian
The Campanian is the fifth of six ages of the Late Cretaceous epoch on the geologic timescale of the International Commission on Stratigraphy (ICS). In chronostratigraphy, it is the fifth of six stages in the Upper Cretaceous Series. Campanian spans the time from 83.6 (± 0.2) to 72.1 (± 0.2) million years ago. It is preceded by the Santonian and it is followed by the Maastrichtian. The Campanian was an age when a worldwide sea level rise covered many coastal areas. The morphology of some of these areas has been preserved: it is an unconformity beneath a cover of marine sedimentary rocks. Etymology The Campanian was introduced in scientific literature by Henri Coquand in 1857. It is named after the French village of Champagne in the department of Charente-Maritime. The original type locality was a series of outcrops near the village of Aubeterre-sur-Dronne in the same region. Definition The base of the Campanian Stage is defined as a place in the stratigraphic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chlamydoselachus
''Chlamydoselachus'' is a genus of sharks and the sole extant member of the family Chlamydoselachidae, in the order Hexanchiformes. It contains two extant and four extinct species. The most widely known species still surviving is the frilled shark (''Chlamydoselachus anguineus''). It is known as a living fossil, along with ''Chlamydoselachus africana'', also known as the southern African frilled shark, which is only found along coastal areas of South Africa. The only two extant species of this genus are deep-sea creatures which are typically weakened in areas closer to the surface. While the two extant species are similar in external appearance, they differ internally. The earliest known fossil members of the genus are ''C. gracilis'' from Angola and ''C. balli'' from Canada, both from the Campanian stage of the Late Cretaceous. Formations with fossil ''Chlamydoselachus'' teeth are thought to be composed of deep-sea sediments, indicating that they have long inhabited deep-sea en ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fossils Of British Columbia
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Though the fossil record is incomplete, numerous studies have demonstrated that there is enough information available to give a good understanding of the pattern of diversification of life on Earth. In addition, the record can predict and fill gaps such as the discovery of ''Tiktaalik'' in the arctic of Canada. Paleontology includes the study of fossils: their age, method of formation, and evolutionary significance. Specimens are sometimes considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years to 4.1 billion years old. Early edition, published online before print. The ob ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Prehistoric Shark Genera
Prehistory, also called pre-literary history, is the period of human history Human history or world history is the record of humankind from prehistory to the present. Early modern human, Modern humans evolved in Africa around 300,000 years ago and initially lived as hunter-gatherers. They Early expansions of hominin ... between the first known use of stone tools by hominins million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared years ago. It took thousands of years for writing systems to be widely adopted, with writing having spread to almost all cultures by the 19th century. The end of prehistory therefore came at different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. It is based on an old conception of history that without ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonoidea
Ammonoids are extinct, (typically) coiled-shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living octopuses, squid, and cuttlefish (which comprise the clade Coleoidea) than they are to nautiluses (family Nautilidae). The earliest ammonoids appeared during the Emsian stage of the Early Devonian (410.62 million years ago), with the last species vanishing during or soon after the Cretaceous–Paleogene extinction event (66 million years ago). They are often called ammonites, which is most frequently used for members of the order Ammonitida, the only remaining group of ammonoids from the Jurassic up until their extinction. Ammonoids exhibited considerable diversity over their evolutionary history, with over 10,000 species having been described. Ammonoids are excellent index fossils, and they have been frequently used to link rock layers in which a particular species or genus is found to specific Geologic time scale, geologic time periods. Their ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Belemnitida
Belemnitida (or belemnites) is an extinct order (biology), order of squid-like cephalopods that existed from the Late Triassic to Late Cretaceous (And possibly the Eocene). Unlike squid, belemnites had an internal skeleton that made up the cone. The parts are, from the arms-most to the tip, the tongue-shaped pro-ostracum, the conical phragmocone, and the pointy guard. The calcite, calcitic guard is the most common belemnite remain. Belemnites, in life, are thought to have had 10 hooked arms and a pair of fins on the guard. The chitinous hooks were usually no bigger than , though a belemnite could have had between 100 and 800 hooks in total, using them to stab and hold onto prey. Belemnites were an important food source for many Mesozoic marine creatures, both the adults and the planktonic juveniles and they likely played an important role in restructuring marine ecosystems after the Triassic–Jurassic extinction event. They may have laid between 100 and 1,000 eggs. Some species ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rolfodon
''Rolfodon'' is an extinct genus of shark in the family Chlamydoselachidae. It is closely related to the extant frilled sharks in the genus '' Chlamydoselachus'', which it can be differentiated from by tooth morphology. It is named after late Canadian paleontologist Rolf Ludvigsen. The earliest fossil teeth of ''Rolfodon'' are known from the Late Cretaceous (Turonian/Santonian boundary) of Japan, and it is one of two genera of Chlamydoselachidae along with ''Chlamydoselachus'' known to have survived the Cretaceous–Paleogene extinction event, although unlike ''Chlamydoselachus'', ''Rolfodon'' went extinct by the Early Pliocene. Remains are known from worldwide, including Japan, Canada, Austria, New Zealand, Angola, Ecuador, and Antarctica. As with modern frilled sharks, ''Rolfodon'' appears to have been specialized to deep-water environments. Species The following species are known: * ''R. bracheri'' (Pfeil, 1983) – Early Miocene ( Aquitanian to Burdigalian) of Austria, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gareth J
Gareth (; Old French: ''Guerehet'', ''Guerrehet'', etc.) is a Knights of the Round Table">Knight of the Round Table in Arthurian legend. He is the youngest son of King Lot and Morgause, Queen Morgause, King Arthur's half-sister, thus making him Arthur's nephew, as well as brother to Gawain, Agravain and Gaheris, and either a brother or half-brother of Mordred. Gareth is particularly notable in ''Le Morte d'Arthur'', where one of its eight books is named after and largely dedicated to him, and in which he is also known by his nickname Beaumains. Arthurian legend French literature The earliest role of Gareth, appearing as Guerrehet, is found in the First Continuation of Chrétien de Troyes's ''Perceval ou le Conte du Graal'' (in the original ''Perceval'', Chrétien himself had only mentioned Gawain's brothers named Agrevain, Gaherriez and Guerrehés). As the protagonist of the story's final episode, he slays the giant known as "Little Knight", thus avenging the death of fairy k ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frilled Shark
The frilled shark (''Chlamydoselachus anguineus''), also known as the lizard shark, is one of the two extant taxon, extant species of shark in the family (biology), family Chlamydoselachidae (the other is the southern African frilled shark, ''Chlamydoselachus africana''). The frilled shark is considered a living fossil, because of its primitive, Eel, anguilliform (eel-like) physical traits, such as a dark-brown color, Elasmobranchii#Description, amphistyly (the articulation of the jaws to the cranium), and a –long body, which has dorsal fin, dorsal, pelvic fin, pelvic, and anal fins located towards the tail. The common name, ''frilled shark'', derives from the fringed appearance of the six pairs of gill slits at the shark's throat. The two species of frilled shark are distributed throughout regions of the Atlantic Ocean, Atlantic and the Pacific Ocean, Pacific oceans, usually in the waters of the outer continental shelf and of the upper continental slope, where the sharks usual ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henri Cappetta
Henri Cappetta (August 29, 1946 – January 6, 2024) was a French ichthyologist specializing in the paleontology of sharks and rays. He was a managing director at the Institut des Sciences de l'Evolution in the University of Montpellier The University of Montpellier () is a public university, public research university located in Montpellier, in south-east of France. Established in 1220, the University of Montpellier is one of the List of oldest universities in continuous opera .... References * H. Cappetta, Handbook of Paleoichthyology (Gustav Fischer, 1987) External links Henri Cappetta on www.isem.cnrs.fr(French) New sharks and rays from the Cenomanian and Turonian of Charentes, France. Romain Vullo, Henri Cappetta and Didier Néraudeau, Acta Palaeontol. Pol. 52 (1), pp. 99–116, 2007 French ichthyologists 1946 births 2024 deaths {{France-zoologist-stub Academic staff of the University of Montpellier 20th-century French zoologists 21st-century French zoologist ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
