Ostariophysi is the second-largest superorder of fish. Members of this superorder are called ostariophysans. This diverse group contains almost 8,000 species, about 28% of known fish species in the world and 68% of freshwater species, and are present on almost all major continents except Antarctica. They have a number of common characteristics such as an alarm substance and a Weberian apparatus. The superorder is classified below: Series Anotophysi Gonorynchiformes, about 37 species Series Oto… (More on Ostariophysi)