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Pycnodontids
Pycnodontidae is an extinct family of ray-finned fishes, ranging from the Triassic period until the Eocene. Genera * ''Acrotemnus'' Agassiz, 1843 * ''Anomoeodus'' Forir, 1887 * '' Athrodon'' Sauvage, 1880 * ''Callodus'' Thurmond, 1974 * '' Coccodus'' * ''Coelodus'' Haeckel * '' Gyrodus'' Agassiz, 1843 * '' Iemanja'' Wenz, 1989 * '' Macromesodon'' Blake, 1905 * '' Microdus'' * ''Micropycnodon'' Hibbard and Graffham, 1945 * '' Neoproscinetes'' De Figueiredo and Silva Santos, 1990 * '' Nonaphalagodus'' Thurmond, 1974 * '' Omphalodus'' von Meyer, 1847 * '' Paleobalistum'' * ''Paramicrodon'' Thurmond, 1974 * '' Polypsephis'' Hay, 1899 * ''Proscinetes'' Gistl, 1848 * ''Pycnodus'' Agassiz, 1835 * '' Pycnomicrodon'' Hibbard and Graffham, 1941 * '' Scalacurvichthys'' Cawley and Kriwet, 2017 * ''Sphaerodus'' Agassiz, 1843 * ''Stemmatodus ''Stemmatodus'' is an extinct genus of prehistoric ray-finned fish that lived in Europe during the Early Cretaceous approximately 129 to 125 millio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pycnodus
''Pycnodus'' (from el, πυκνός , 'dense' and el, ὀδούς 'tooth') is an extinct genus of ray-finned fish ranging from the Jurassic to Eocene periods. As its name suggests, it is the type genus of Pycnodontiformes. The known whole fossils of ''Pycnodus'' are around long, and have a superficial resemblance to angelfish or butterflyfish. The animals, as typical of all other pycnodontids, had many knob-like teeth, forming pavements in the jaws with which to break and crush hard food substances, probably mollusks and echinoderms. These teeth are the most common form of fossil. ''Pycnodus'' fossils have been found in present-day India, North Africa, Belgium, England, and Italy, regions corresponding with the Tethys Ocean. A specimen of the prehistoric whale, '' Basilosaurus isis'', was found in the Eocene-aged Wadi El Hitan ( ar, وادي الحيتان, lit=Valley of the Whales ) is a paleontological site in the Faiyum Governorate of Egypt, some south-west of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Coccodus
''Coccodus'' is an extinct genus of extinct pycnodontid fish that lived during the lower Cenomanian. The various species had a pair of massive, curved spines emanating from the lower sides of the head, and one curved spine on the top of its head. Unlike most pycnodontids (which tend to have short, marine butterflyfish-like bodies), ''Coccodus'' species had a comparatively long body, giving the living animals a superficial resemblance to a scaly chimaera. ''Coccodus'' is closely related to the similarly spined genera ''Trewavasia, Corusichthys, Paracoccodus'', and ''Hensodon'', which also lived during the Cenomanian of Lebanon. Formerly in ''Coccodus'' The species ''Coccodus lindstroemi'' was recently determined to be a species complex, and various specimens assigned to ''C. lindstroemi'' were redescribed as species of the gladiopycnodontid genus '' Joinivillichthys''Taverne, Louis, and Luigi Capasso. "On the “Coccodus” lindstroemi species complex (Pycnodontiformes, Gladi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triassic First Appearances
The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago ( Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period of the Mesozoic Era. Both the start and end of the period are marked by major extinction events. The Triassic Period is subdivided into three epochs: Early Triassic, Middle Triassic and Late Triassic. The Triassic began in the wake of the Permian–Triassic extinction event, which left the Earth's biosphere impoverished; it was well into the middle of the Triassic before life recovered its former diversity. Three categories of organisms can be distinguished in the Triassic record: survivors from the extinction event, new groups that flourished briefly, and other new groups that went on to dominate the Mesozoic Era. Reptiles, especially archosaurs, were the chief terrestrial vertebrates during this time. A specialized subgroup of archosaurs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pycnodontiformes
Pycnodontiformes is an extinct order of primarily marine bony fish. The group first appeared during the Late Triassic and disappeared during the Eocene. The group has been found in rock formations in Africa, Asia, Europe, North and South America. They were small to middle-sized fish, generally with laterally-compressed deep bodies, some with almost circular outlines, adapted for manuverability in reef-like environments. The group was morphologically diverse containing forms such the very short but deep Gebrayelichthyidae and the horned '' Ichthyoceros,'' both from the early Late Cretaceous of Lebanon. Most, but not all members of the groups had jaws with round and flattened teeth, well adapted to crush food items ( durophagy), such as echinoderms, crustaceans and molluscs. Some pyncodontiformes developed piranha like teeth used for eating flesh. Most species inhabited shallow marine reef environments, while a handful of species lived in freshwater or brackish conditions. Whil ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stemmatodus
''Stemmatodus'' is an extinct genus of prehistoric ray-finned fish that lived in Europe during the Early Cretaceous approximately 129 to 125 million years ago. See also * List of prehistoric bony fish * Prehistoric fish The evolution of fish began about 530 million years ago during the Cambrian explosion. It was during this time that the early chordates developed the skull and the vertebral column, leading to the first craniates and vertebrates. The first fish ... References Early Cretaceous fish Pycnodontiformes genera Early Cretaceous fish of North America {{cretaceous-fish-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sphaerodus
''Lepidotes'' (from el, λεπιδωτός , 'covered with scales') (previously known as ''Lepidotus'') is an extinct genus of Mesozoic ray-finned fish. It has been considered a wastebasket taxon, characterised by "general features, such as thick rhomboid scales and, for most of the species, by semi-tritorial or strongly with dozens of species assigned to it. Fossils attributed to ''Lepidotes'' have been found in Jurassic and Cretaceous rocks worldwide.López-Arbarello, A. (2012).Phylogenetic Interrelationships of Ginglymodian Fishes (Actinopterygii: Neopterygii). ''PLoS One'', 7(7): e39370. It has been argued that ''Lepidotes'' should be restricted to species closely related to the type species ''L. gigas,'' which are only known from the Early Jurassic of Central Europe, with most other species being not closely related, with other species transferred to new genera such as '' Scheenstia.'' ''Lepidotes'' belongs to Ginglymodi, a clade of fish whose only living representatives ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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