Hagfish
Hagfish are marine craniates of the class Myxini, also known as
Hyperotreti. Despite their name, there is some debate about
whether they are strictly fish (as there is for lampreys), since
they belong to a much more primitive lineage than any other
group that is commonly defined fish (Chondrichthyes and
Osteichthyes). Their unusual feeding habits and slime-producing
capabilities have led members of the scientific and popular
media to dub the hagfish as the most "disgusting" of all sea
creatures.
