Anguilliformes families

The Anguillidae are a family of ray-finned fish that contains the freshwater eels. All the extant species and six subspecies in this family are in the genus Anguilla, and are elongated fish of snake-like bodies, with long dorsal, caudal and anal fins forming a continuous fringe. They are catadromous, spending their adult lives in freshwater, but migrating to the ocean to spawn.

thumb|Spotted garden eel (Heteroconger hassi) The Congridae are the family of conger and garden eels. Congers are valuable and often large food fishes, while garden eels live in colonies, all protruding from the sea floor after the manner of plants in a garden (thus the name). The family includes over 220 species in 32 genera.

Ophichthidae is a family of fish in the order Anguilliformes, commonly known as the snake eels. The term "Ophichthidae" comes from Greek ophis ("serpent") and ichthys ("fish"). Snake eels are also burrowing eels. They are named for their physical appearance, as they have long, cylindrical, snake-like bodies. This family is found worldwide in tropical to warm temperate waters. They inhabit a wide range of habitats, from coastal shallows and even rivers, to depths below . Most species are bottom dwellers, hiding in mud or sand to capture their prey of crustaceans and small fish, but some are pel

The Muraenesocidae, or pike congers, are a small family of marine eels found worldwide in tropical and subtropical seas. Some species are known to enter brackish water.

thumb|Duckbill eel from 2017 NOAA Okeanos expedition at a depth of 2,600m (8530ft)

The Moringuidae are a small family of eels commonly known as spaghetti eels or worm eels, although the latter name is also shared with other families of eels.

The Chlopsidae, or false morays, are a family of marine ray-finned fishes belonging to the order Anguilliformes, the eels. The eels in this family are found in coral reefs worldwide. As their name suggests, they somewhat resemble moray eels in appearance. However, they are smaller than true morays, ranging from in length.

The Heterenchelyidae or mud eels are a small family of eels native to the Atlantic, Mediterranean, and eastern Pacific.

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