An order of teleost fishes, also known as Haplomi and Esocae. Fishes of this small order, comprising two families and 10 species, can be identified by a combination of the following characteristics: dorsal and anal fins are posteriorly placed on a rather slender body; maxillae are in the gape of the mouth and toothless; small uniform teeth are on the tongue and basibranchial elements; and there are no adipose fin, breeding tubercles, pyloric ceca, or mesocoracoid bone. Both families occur in freshwater of the Northern Hemisphere.