Anguilliformes Access

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

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

: 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. anguilliformes

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

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. The oldest fossil record of a living true eel lineage

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

: True eels are distinguished by the fusion of rostral bones into a single complex and the lack of a pelvic girdle. Their dorsal, anal, and caudal fins are often

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.