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Pycnodontiformes Genera
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] |
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 .org ;Triassic * , France ;Jurassic * Qu |