Anguilliformes

: 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.

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

: Many species lack scales entirely; if present, they are deeply embedded in the skin. Diversity and Habitat : Most species have a snakelike appearance with

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