The oldest fossil record of a living true eel lineage ... - bioRxiv
: Many species lack scales entirely; if present, they are deeply embedded in the skin. Diversity and Habitat anguilliformes
: True eels are distinguished by the fusion of rostral bones into a single complex and the lack of a pelvic girdle. The oldest fossil record of a living true eel lineage
: 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 family Anguillidae includes catadromous species that
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.