1. Agnatha is a class of jawless fish that includes lampreys and hagfish.
2. The agnatha have a unique feeding mechanism that involves sucking blood from other fish.
3. Scientists study the agnatha to better understand the evolution of jawed vertebrates.
4. The agnatha have a cartilaginous skeleton and lack paired fins.
5. The agnatha are considered primitive fish because they do not have jaws.
6. Fossils of agnatha have been found in rocks dating back hundreds of millions of years.
7. The agnatha play an important role in marine ecosystems as both predators and scavengers.
8. Some species of agnatha are parasitic, attaching themselves to larger fish to feed.
9. The agnatha have a distinctive body shape with a cylindrical body and a long, eel-like tail.
10. The agnatha are a diverse group of fish that can be found in both freshwater and saltwater environments.