Diabolepis
 Diabolepis (or Diabolichthys) is an extinct genus of very primitive lungfish which lived about 400 million years ago in the Early Devonian period of South China. Diabolepis is the most basal known dipnoan.A rather small fish the fossil has risen to prominence as it has four nares like most fish while modern lungfish have only two the hindmost pair having moved on to the palate serving as choanae.