Agnatha
/ægˈneɪθə/1
- Zoology a group of primitive jawless vertebrates which includes the lampreys, hagfishes, and many fossil fishlike forms【动】无颌类脊椎动物。比较CYCLOSTOME.
1.1
- Superclass Agnatha: the living forms are in the classes Myxini (hagfishes) and Cephalaspidomorphi (lampreys).无颌总纲：现存种类见于盲鳗纲（盲鳗科）和头甲状纲（七鳃鳗科）。
派生词
agnathan
noun & adjective词源
from modern Latin Agnatha, from A-1 'without'+Greek gnathos 'jaw'.