Characiformes
…is about 1.4–1.7 cm (0.55–0.67 in) in the Bolivian pygmy blue characin, Xenurobrycon polyancistrus. The Characiformes form part of a series called the Otophysi within the superorder Ostariophysi. The Otophysi contain three other orders, Cypriniformes, Siluriformes, and Gymnotiformes. The Characiformes form a…