Hagfish

Hagfish have no true fins and have six or eight barbels around the mouth and a single nostril.

Hagfish are marine craniates of the class Agnatha or Myxini, moreover reputed to be Hyperotreti. Some specialists respect Myxini as not having a place with the subphylum Vertebrata. That is, they are the just living beasts that have a skull but not a vertebral section.