Agnathan and Lamper eel

Agnathan noun - Eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms.

Lamper eel and agnathan are semantically related. In some cases you can replace phrase "Lamper eel" with "Agnathan", this terms are similar.

Lamper eel noun - Primitive eellike freshwater or anadromous cyclostome having round sucking mouth with a rasping tongue.

Agnathan and lamper eel are semantically related. You can use "Agnathan" instead a noun phrase "Lamper eel".