jawless vertebrate

• Terme scientifique désignant un groupe de vertébrés primitifs aquatiques dépourvus de mâchoires, tels que les lamproies et les myxines, appartenant à la superclasse des agnathes.

A scientific term referring to a group of primitive fish-like animals that lack jaws, such as lampreys and hagfish, belonging to the superclass Agnatha.

1. AgnathanC2formal

   A member of the superclass Agnatha, comprising primitive fish-like vertebrates that lack jaws.

   agnathe

   • Lampreys and hagfish are the only surviving examples of jawless vertebrates.
   • Fossil records show that jawless vertebrates were among the earliest chordates.
   • The study of jawless vertebrates helps scientists understand the evolution of the vertebrate skeleton.