 The teleosts or Teleostei ( Greek : teleios , " complete " + osteon , " bone " ) are by far the largest infraclass in the class Actinopterygii , the ray @-@ finned fishes , and make up 96 percent of all fish . This diverse group arose in the Triassic period and members are arranged in about 40 orders and 448 families .
 kwiet 2019.
The teleosts are by far the largest infraclass in the class Actinopterygii, the ray-finned fishes, and make up 96% of all fish. This diverse group arose in the Triassic period and members are arranged