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Dapediidae
Dapediidae is an extinct family of neopterygian ray-finned fish that lived during from the Late Triassic to Late Jurassic (Norian to Tithonian). It is the only family of the order Dapediiformes. Its members were historically placed within the ginglymodian family Semionotidae, but were moved to their own family in 1966. Description Dapediids had deep, laterally flattened circular bodies covered in thick ganoid scales, which gave them a resemblance to the pycnodontiforms, a group they may or may not be related to. Their teeth were adapted towards a durophagous diet; some dapediids fed on hard-shelled invertebrates, while at least one genus ('' Hemicalypterus'') may have been herbivorous. Classification Dapediids are usually considered to be either basal ginglymodians or stem group representatives of the wider clade Holostei, but some studies have found them to be early-diverging stem-teleost Teleostei (; Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dapediidae
Dapediidae is an extinct family of neopterygian ray-finned fish that lived during from the Late Triassic to Late Jurassic (Norian to Tithonian). It is the only family of the order Dapediiformes. Its members were historically placed within the ginglymodian family Semionotidae, but were moved to their own family in 1966. Description Dapediids had deep, laterally flattened circular bodies covered in thick ganoid scales, which gave them a resemblance to the pycnodontiforms, a group they may or may not be related to. Their teeth were adapted towards a durophagous diet; some dapediids fed on hard-shelled invertebrates, while at least one genus ('' Hemicalypterus'') may have been herbivorous. Classification Dapediids are usually considered to be either basal ginglymodians or stem group representatives of the wider clade Holostei, but some studies have found them to be early-diverging stem-teleost Teleostei (; Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heterostrophus
''Heterostrophus'' is an extinct genus of ray-finned fish belonging to the family Dapediidae. It lived from the Callovian stage of the Middle Jurassic epoch to the early Tithonian In the geological timescale, the Tithonian is the latest age of the Late Jurassic Epoch and the uppermost stage of the Upper Jurassic Series. It spans the time between 152.1 ± 4 Ma and 145.0 ± 4 Ma (million years ago). It is preceded by the K ... stage of the Late Jurassic epoch. References Dapediidae Prehistoric ray-finned fish genera Middle Jurassic fish Late Jurassic fish {{paleo-rayfinned-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dandya (fish)
''Dandya'' is an extinct genus of ray-finned fish belonging to the family Dapediidae. It contains one species, ''D. ovalis''. It is known from the Late Triassic of Lombardy, Northern Italy Italy ( it, Italia ), officially the Italian Republic, ) or the Republic of Italy, is a country in Southern Europe. It is located in the middle of the Mediterranean Sea, and its territory largely coincides with the homonymous geographical re .... References External links Bony fish in the online Sepkoski Database Dapediidae Triassic bony fish Late Triassic fish Triassic Italy Fossils of Italy Triassic fish of Europe Fossil taxa described in 1905 {{Paleo-rayfinned-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aetheolepis
''Aetheolepis'' is an extinct genus of ray-finned fish which lived in freshwater environments in what is now Western Australia and New South Wales during the Jurassic period. It contains one species, ''A. mirabilis''. ''Aetheolepis'' was previously thought to be an archaeomaenid, until a 2016 study instead recovered it as a member of the family Dapediidae. Like other dapediids, it had a deep, discoid-shaped body. Fossils of ''A. mirabilis'' have been found in the Talbragar River fossil beds of New South Wales and the Colalura Sandstone of Western Australia. It was named by Arthur Smith Woodward in 1865 along with other Talbragar fish. See also * List of prehistoric bony fish genera This list of prehistoric bony fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be bony fish (class Osteichthyes), excluding purely vernacular terms. The list includes al ... References Dapediidae Freshwater fish ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemicalypterus
''Hemicalypterus'' is an extinct genus of prehistoric ray-finned fish that lived during the late Triassic period (approx. 221.4 to 205.6 Ma). It contains a single species, ''Hemicalypterus weiri''. Fossils have been collected in the southwestern United States, including Utah and New Mexico. ''Hemicalypterus'' belonged to the family Dapediidae, and like other members of its family, it was a deep-bodied fish with a covering of thick ganoid scales. It differed from other dapediids in lacking scales on the posterior part of the body, and in possessing unusual, multicuspid teeth. These teeth were similar to those of modern-day herbivorous fish, which indicates that ''Hemicalypterus'' may have been a herbivore as well. See also * List of prehistoric bony fish genera This list of prehistoric bony fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be bony fish (class Osteichthyes), excluding purely vernacular te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dapedium Politum
''Dapedium'' (from el, δαπέδων , 'pavement') is an extinct genus of primitive neopterygian ray-finned fish. The first-described finding was an example of ''D. politum'', found in the Lower Lias of Lyme Regis, on the Jurassic Coast of England (Leach 1822). ''Dapedium'' lived in the late Triassic and Jurassic periods. Appearance The various species of ''Dapedium'' ranged from long, and all had an oval to near-circular body. The skin was covered with thick, rhomboid, ganoid (enamel-like) scales. The smallest species so far found is ''D. noricum''. The skull was armoured with bony dermal plates, which were especially plentiful in the orbital region. These bones bore irregular tubercles. The small pectoral and pelvic fins, along with the extended dorsal and anal fins formed a functional unit with the tail. The tail was short and stout, providing the power for a sudden change in direction while the fish was swimming. The upper jaw of ''Dapedium'' was moveable and coul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dapedium
''Dapedium'' (from el, δαπέδων , 'pavement') is an extinct genus of primitive neopterygian ray-finned fish. The first-described finding was an example of ''D. politum'', found in the Lower Lias of Lyme Regis, on the Jurassic Coast of England (Leach 1822). ''Dapedium'' lived in the late Triassic and Jurassic periods. Appearance The various species of ''Dapedium'' ranged from long, and all had an oval to near-circular body. The skin was covered with thick, rhomboid, ganoid (enamel-like) scales. The smallest species so far found is ''D. noricum''. The skull was armoured with bony dermal plates, which were especially plentiful in the orbital region. These bones bore irregular tubercles. The small pectoral and pelvic fins, along with the extended dorsal and anal fins formed a functional unit with the tail. The tail was short and stout, providing the power for a sudden change in direction while the fish was swimming. The upper jaw of ''Dapedium'' was moveable and coul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Semionotidae
Semionotiformes is an order of primitive, ray-finned, primarily freshwater fish from the Middle Triassic (Anisian) to the Late Cretaceous (Maastrichtian). The best-known genus is ''Semionotus'' of Europe and North America. Their closest living relatives are gars (Lepisosteidae), with both groups belonging to the clade Ginglymodi within the Holostei. Classification * Order †Semionotiformes Arambourg & Bertin 1958 sensu López-Arbarello 2012 ** Genus ?†''Orthurus'' Kner 1866 ** Genus †'' Sangiorgioichthys'' Tintori & Lombardo 2007 ** Genus †''Luoxiongichthys'' Wen et al. 2011 ** Genus †''Aphanepygus'' Bassani 1879 ** Genus †'' Placidichthys'' Brito 2000 ** Family † Pleurolepididae Lütken 1871 *** Genus †'' Pleurolepis'' Agassiz 1863 non Quenstedt 1852 ** Family †Macrosemiidae Wagner 1860a corrig. Cope 1889 sensu Murray & Wilson 2009 acrosemii Wagner 1860a*** Genus †'' Eusemius'' Vetter 1881 *** Genus †'' Blenniomoeus'' Costa 1850 Calignathus.html"_;"title="' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Teleost
Teleostei (; Greek ''teleios'' "complete" + ''osteon'' "bone"), members of which are known as teleosts ), is, by far, the largest infraclass in the class Actinopterygii, the ray-finned fishes, containing 96% of all extant species of fish. Teleosts are arranged into about 40 orders and 448 family (biology), families. Over 26,000 species have been described. Teleosts range from giant oarfish measuring or more, and ocean sunfish weighing over , to the minute male anglerfish ''Photocorynus spiniceps'', just long. Including not only torpedo-shaped fish built for speed, teleosts can be flattened vertically or horizontally, be elongated cylinders or take specialised shapes as in anglerfish and seahorses. The difference between teleosts and other bony fish lies mainly in their jaw bones; teleosts have a movable premaxilla and corresponding modifications in the jaw musculature which make it possible for them to cranial kinesis, protrude their jaws outwards from the mouth. This is of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holostei
Holostei is a group of ray-finned bony fish. It is divided into two major clades, the Halecomorphi, represented by a single living species, the bowfin (''Amia calva''), as well as the Ginglymodi, the sole living representatives being the gars (Lepisosteidae), represented by seven living species in two genera (''Atractosteus'', ''Lepisosteus''). The earliest members of the clade appeared during the Early Triassic, over 250 million years ago. Holostei was thought to be regarded as paraphyletic. However, a recent study provided evidence that the Holostei are the closest living relates of the Teleostei, both within the Neopterygii. This was found from the morphology of the Holostei, for example presence of a paired vomer. Holosteans are closer to teleosts than are the chondrosteans, the other group intermediate between teleosts and cartilaginous fish, which are regarded as (at the nearest) a sister group to the Neopterigii. The spiracles of holosteans are reduced to vestigial remnan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stem Group
In phylogenetics, the crown group or crown assemblage is a collection of species composed of the living representatives of the collection, the most recent common ancestor of the collection, and all descendants of the most recent common ancestor. It is thus a way of defining a clade, a group consisting of a species and all its extant or extinct descendants. For example, Neornithes (birds) can be defined as a crown group, which includes the most recent common ancestor of all modern birds, and all of its extant or extinct descendants. The concept was developed by Willi Hennig, the formulator of phylogenetic systematics, as a way of classifying living organisms relative to their extinct relatives in his "Die Stammesgeschichte der Insekten", and the "crown" and "stem" group terminology was coined by R. P. S. Jefferies in 1979. Though formulated in the 1970s, the term was not commonly used until its reintroduction in 2000 by Graham Budd and Sören Jensen. Contents of the crown gr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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