Anguilliformes Apr 2026

: Most species have a snakelike appearance with a complete absence of pelvic fins . Their dorsal, anal, and caudal fins are often continuous, forming a single fringe around the tail.

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.

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

: 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

The oldest fossil record of a living true eel lineage ... - bioRxiv : Most species have a snakelike appearance with

True eels are found globally in a vast range of aquatic environments:

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 : Many species lack scales entirely; if present,

: The majority are marine, inhabiting everything from shallow coral reefs (like moray eels ) to the abyssal zone (like gulper eels ).