jawless fish

• Poissons du super-ordre des Agnatha, dépourvus de mâchoires et de nageoires paires, comprenant les lamproies et les myxines actuelles ainsi que de nombreuses formes fossiles.

A type of fish belonging to the superclass Agnatha, characterized by the absence of jaws and paired fins, including modern lampreys and hagfish, as well as many extinct prehistoric forms.

1. AgnathanC1formal

   A type of primitive fish that lacks a jaw, belonging to the superclass Agnatha.

   agnathe

   • Lampreys and hagfish are the only surviving species of jawless fish.
   • Fossils of jawless fish date back to the Ordovician period.
   • Jawless fish have a cartilaginous skeleton and a round, sucker-like mouth.