Last week in lab we looked at hagfish as an example of a primitive chordate.
New Scientist has an article with a great photo of the hagfish and a video of them repelling other fish. Another common name for the hagfish is "slime eel". Watch what happens when fish come up and bite the hagfish.
Zoologger: Slime killer hagfish feasts in rotten flesh - life - 27 October 2011 - New Scientist