agnathan

• Nom désignant un vertébré aquatique de forme allongée, dépourvu de mâchoires et de nageoires paires, comprenant les cyclostomes actuels (lamproies et myxines) ainsi que des formes fossiles.

A noun referring to an eel-shaped vertebrate that lacks jaws and paired appendages, including cyclostomes and certain extinct forms.

1. Jawless fishC2formalscientific

   An eel-shaped vertebrate without jaws or paired appendages, including the cyclostomes and some extinct forms.

   agnathe

   • Agnathans are considered the most primitive living vertebrates.
   • Lampreys and hagfish are the only surviving agnathans.
   • Fossil records show that agnathans were abundant in the Ordovician period.

   Synonymescyclostomejawless fishostracoderm

   Antonymesgnathostome