Anguilliformes

The most distinct feature of the Anguilliformes is their . After hatching as transparent leptocephali , they drift on ocean currents for months or years. They then transform into juvenile "glass eels" before reaching their adult form.

Anguilliformes is the taxonomic order of , a group of ray-finned fishes containing approximately 1,000 species across 20 families. They are defined by their elongated, cylindrical bodies and a unique life cycle involving a transparent, leaf-like larval stage called a leptocephalus . Key Biological Features anguilliformes

: The majority are marine, inhabiting everything from shallow coral reefs (like moray eels ) to the abyssal zone (like gulper eels ). The most distinct feature of the Anguilliformes is their

While many other fish—such as electric eels and swamp eels—have evolved similar elongated shapes, they belong to different taxonomic orders and are not "true" eels. Anguilliformes is the taxonomic order of , a

The oldest fossil record of a living true eel lineage ... - bioRxiv

: The family Anguillidae includes catadromous species that live in freshwater but migrate to the ocean to spawn. Major Groups : Well-known families include: Muraenidae : Moray eels. Congridae : Conger and garden eels. Anguillidae : Freshwater eels. Ophichthidae : Snake and worm eels. Life Cycle

: Many species lack scales entirely; if present, they are deeply embedded in the skin. Diversity and Habitat