There are only a few vertebrates that have no jaws, such as lampreys and hagfish. Jaws evolved from gill arches in fish and provided benefits like being able to hold food so it couldn't escape from the stomach. Paired fins also evolved around the same time, and it would have been difficult to swim without front fins. Both lampreys and hagfish are jawless fish, with lampreys having an eel-like body structure and hagfish having eyes beneath their skin and no vertebrae.

1. Name a vertebrate that has no jaws. There are only a few. Evidence supports, jaws evolved from gill arches in fish. What would be the benefit to having jaws? Hold food, Food can’t escape stomach Paired fins came at about the same time. Imagine trying to swim with no front fins

2. Class Agnatha Video

3. The only jawless fish left – and there are 80 Species of them Lampreys and hagfish Hagfish Eyes beneath the skin, Have no vertebrae

4. Eat small invertebrates Eat dead organisms Bottom dwelling Sometimes the burrow into the dead organisms and live inside eating the organs. They can tie themselves in knots and release a slime to get away from predators.

5. Hagfish reproduction Not much is known Will lay 20 – 30 eggs Can have couple of different batches of eggs inside female. Some hermaphrodites have been found.

6. Hagfish defense. – Eating, tying in knots, SL part 4 min 1.01 Sea cucumber defense–SL part 2 min 7.42

7. Lampreys Eel like in body structure Have large eyes Many live in freshwater All reproduce in freshwater Some are free living Some attach to hosts as parasites. Some never eat as adults.

9. Reproduction Males make a crater Females deposit the eggs, Males fertilize the eggs Video clip