 In 1989, morphological and genetic studies indicated trout of the Pacific basin were genetically closer to Pacific salmon ("Oncorhynchus" species) than to the "Salmo"s–brown trout ("S. trutta") or Atlantic salmon ("S. salar") of the Atlantic basin.Thus, in 1989, taxonomic authorities moved the rainbow, cutthroat and other Pacific basin trout into the genus "Oncorhynchus".The fish has teeth under its tongue, on the roof of the mouth, and in the front of the mouth.