The Most Funny Fish In The World

† - indicates extinct taxon
Some palaeontologists contend that because Conodonta are chordates, they are primitive fish.
The position of hagfish in the phylum chordata is not settled. Phylogenetic research in 1998 and 1999 supported the idea that the hagfish and the lampreys form a natural group, the Cyclostomata, that is a sister group of the Gnathostomata.