This rare fish has been called a living fossil
They possess a three-lobed caudal fin, also called a trilobate 
fin or a... [DOC] [TLE] 'Living fossil' or no, this strange, rare fish has a lung - LA Times [PAR] Sep 15, 2015 ... 'Living fossil' or no, this strange, rare fish has a lung ... in the world's waters today, 
including the appropriately named lungfish as well as the coelacanth.