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.
: 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 distinguished by the fusion of rostral bones into a single complex and the lack of a pelvic girdle. While many other fish—such as electric eels and
: Many species lack scales entirely; if present, they are deeply embedded in the skin. Diversity and Habitat and caudal fins are often continuous
The oldest fossil record of a living true eel lineage ... - bioRxiv