Examples of agnatha, or jawless fish, include lampreys and hagfish. These fish are characterized by their lack of jaws, paired fins, and scales. They are considered primitive vertebrates and play important roles in marine ecosystems.
jawless fishes
I don't know but i will do some research...
Externally
skin
without jaws
n. 1. a class of eel-shaped chordates with a cartilaginous skeleton lacking jaws, scales, and pelvic fins. Among these are the lampreys and hagfishes. There are some extinct forms.
these are jawless fish which attached themselves by suckers to other fish in order to parasitize off them. Hagfish and Lampreys are common examples
Agnatha, also known as jawless fish, lack jaws and scales. They have a cartilaginous skeleton, a round mouth, and a single nostril on their head. Agnatha are also known for their ability to produce slime as a defense mechanism.
Class Agnatha
with gills; they're fish!
by the gill slits