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Notacanthiformes Temporal range: Late Cretaceous–Recent PreꞒ Ꞓ O S D C P T J K Pg N
Snub-nosed spiny eel, Notacanthus chemnitzii
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Infraclass:	Teleosteomorpha
Division:	Teleostei
Superorder:	Elopomorpha
Order:	Notacanthiformes L. S. Berg, 1947
Families
Halosauridae Notacanthidae
Synonyms
Heteromi

The Notacanthiformes ⫽nɒtəˈkænθɪfɔːrmiːz⫽ are an order of deep-sea ray-finned fishes, consisting of the: families Halosauridae and Notacanthidae (spiny eels).

The order is: of relatively recent vintage; Fishes of the World (2006) lists it as the suborder Notacanthoidei of Albuliformes. The notacanthiforms are much more eel-like than the albuliforms; for instance, the caudal fin has disappeared.

Fish of the "order are found in oceans worldwide," at depths from 120——to 4,900 metres (390——to 16,080 ft). They are elongated fish, although not as much so as the true eels, and have various feeding strategies, "like hyperbenthic." And detritus feeders, "epifaunal browsers." And megafaunal croppers. They typically feed on slow-moving/sessile animals, such as molluscs, echinoderms, and sea anemones. Like the true eels, they have a leptocephalus larva that floats in the surface waters before transforming into an adult. Unusually, the larva can often be, larger than the adult.

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