Osteoglossiformes (Lat. "bony tongues") is a relatively primitve Scientific classification or biological classification refers to how biologists group and categorize extinct and living species of organisms. Modern classification has its roots in the system of Carolus Linnaeus, who grouped species according to shared physical characteristics. These groupings have been revised since Linnaeus to improve consistency with the Darwinian... order of Orders See text The Actinopterygii are the ray-finned fish. They are the dominant group of vertebrates, with over 27,000 species ubiquitous throughout fresh water and marine environments. They are traditionally treated as a subclass of the Osteichthyes, or bony fish, but as that group is paraphyletic they may... ray-finned fish.

Members of the order are notable for having toothed or bony tongues, and for having the forward part of the For the Physics term GUT, please refer to Grand unification theory The gastrointestinal or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and... gastrointestinal tract pass to the left of the The esophagus, oe/œsophagus*, or gullet is the muscular tube in vertebrates through which ingested food passes from the mouth area to the stomach. Food is passed through the esophagus by using the process of peristalsis. Specifically, in mammals, it connects the pharynx, which is the body cavity that... oesophagus and In anatomy, the stomach (in ancient Greek στομάχι) is an organ in the alimentary canal used to digest food. Generally, the stomachs primary function is not the adsorption of nutrients from digested food; this task is usually performed by the intestine. Latin names... stomach (for all other fish it passes to the right).

One species, the Binomial name Arapaima gigas , The Arapaima gigas is the worlds largest freshwater fish. It can reach lengths of up to 4.5m and weigh up to 200 kg. Unfortunately it is one of the most sought after fish species in South America, often captured by spearing for exportation, so... arapaima (Arapaima gigas) is the largest For the village on the Isle of Wight, see Freshwater, Isle of Wight. Fresh water (also freshwater or fresh-water) is water that contains only minimal quantities of dissolved salts, especially sodium chloride, thus distinguishing it from sea water or brackish water. All freshwater ultimately comes from precipitation of atmospheric... freshwater fish known, with specimens reported up to 4.5 m in length.

The mooneyes ( Species Hiodon alosoides Hiodon tergisus Hiodon consteniorum (extinct) The mooneyes are a family Hiodontidae of primitive ray-finned fish comprising two living and one extinct species in the genus Hiodon. The mooneye, Hiodon tergisus Lesueur 1818, is widespread across North America, living in the clear waters of lakes, ponds, and... Hiodontidae) are often classified here, but may also be placed in a separate order Hiodontiformes.

External links

• Mikko's Phylogeny for Osteoglossiformes (http://www.fmnh.helsinki.fi/users/haaramo/Metazoa/Deuterostoma/Chordata/Actinopterygii/Osteoglossomorpha/Osteoglossiformes_families.htm)
• Osteoglossiforms for aquaria (http://www.wetwebmedia.com/FWSubWebIndex/osteoglossiforms.htm)