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Pycnodont
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. While ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gebrayelichthyidae
Gebrayelichthyidae is a family of extinct pycnodontid fish, with a superficially shrimpfish-like appearance that lived during the lower Cenomanian. The family is composed of two genera, the type genus, '' Gebrayelichthys'', and the monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ... '' Maraldichthys''. The Gebrayelichthyids are highly modified in appearance, having their bodies compressed and vertebrae elongated. Gebrayelichthyidae, together with Gladiopycnodontidae and Coccodontidae, make up the pycnodontid superfamily Coccodontoidea. Description ''Gebrayelichthys'' was strongly flattened on the sides. The body height was 1.8 to 2 times the body length. The head and torso each made up half of the total length. The skull was similar to that of other Pycnodontif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ichthyoceros
''Ichthyoceros spinosus'' is an extinct pycnodontid that lived during the lower Cenomanian of what is now Lebanon. ''I. spinosus'' had a triple, forward-pointing horn-like spine between its eyes, very similar to the single spine of ''Trewavasia'', and a massive, multipointed spine emanating from the back of its head. It was originally placed in the family Coccodontidae, but then was transferred to "Trewavasiidae" with ''Trewavasia''. Recently, it has been placed in Gladiopycnodontidae due to recent anatomical similarities with the various genera within that family, including '' Gladiopycnodus''. See also * Prehistoric fish * List of prehistoric bony fish * ''Trewavasia ''Trewavasia carinata'' is an extinct pycnodontid fish in the family Coccodontidae that lived during the lower Cenomanian of what is now Lebanon Lebanon ( , ar, لُبْنَان, translit=lubnān, ), officially the Republic of Lebanon () o ...'', its close relative References Pycnodontiform ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gyrodus
''Gyrodus'' (from el, γύρος , 'curved' and el, ὀδούς 'tooth') is an extinct genus of pycnodontiform ray-finned fish that lived from the late Triassic ( Rhaetian) to the middle Cretaceous ( Cenomanian). Distribution Fossils of ''Gyrodus'' have been found in:''Gyrodus'' at Fossilworks.org ;Triassic * Franche-Comté, France ;Jurassic * Quehita and Quebrada Formations, Chile * Canjuers-Les Bessons quarry and Fumel, France * < ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Piranhamesodon
''Piranhamesodon pinnatomus'' is a pycnodontiform fish from the Late Jurassic (ca. ). It was described from the Plattenkalk deposits of the Solnhofen Formation, in Bavaria, Germany. It is notable for having sharp, serrated teeth highly reminiscent of a piranha, a highly unusual trait as most other species in the order Pycnodontiformes were shellfish eaters with flat, crushing teeth. It is also the oldest known bony fish with this trait. This unusual combination is reflected in its genus name, which is a combination of piranha and the frequent pycnodontiform genus suffix ''Mesodon''. Fossils of other fish found in the same area have torn fins possibly attributable to this species. See also * 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 fis ... * List of pre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Athrodon
''Athrodon'' is an extinct genus of pycnodontid that lived in shallow seas in what is now England and France from the Late Jurassic until the genus extinction during the start of the late Cretaceous. The various species are very similar in splenial bone and tooth morphology to '' Mesodon''. Otherwise, no articulated or complete specimen is known: all fossil specimens are bone fragments and disarticulated teeth. See also * 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 fis ... * List of prehistoric bony fish References A. S. Woodward 1916 The fossil fishes of the English Wealden and Purbeck Formations. Pycnodontiformes genera Late Jurassic fish Jurassic bony fish Cretaceous bony fish Jurassic fish of Europe Cretaceous fish of Europe {{Cretaceous ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paramicrodon
''Paramicrodon'' is a genus of hoverflies, with eight known species. They differ from ''Microdon'' by their short antennae and the lack of appendices on vein R4+5. Biology Larvae are found in ant Ants are eusocial insects of the family Formicidae and, along with the related wasps and bees, belong to the order Hymenoptera. Ants evolved from vespoid wasp ancestors in the Cretaceous period. More than 13,800 of an estimated total of ... nests. Distribution They are native to Oriental, Australian, and Neotropical regions. Species *'' P. cinctellus'' ( Sack, 1926) *'' P. delicatulus'' Hull, 1937 *'' P. flukei'' Curran, 1936 *'' P. lorentzi'' Meijere, 1913 *'' P. miranda'' (Herve-Bazin, 1926) *'' P. nigripennis'' ( Sack, 1922) *'' P. novus'' Hull, 1937 *'' P. toxopei'' Meijere, 1929 References {{taxonbar, from1=Q2746444 Hoverfly genera Microdontinae Diptera of Australasia Diptera of Asia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
