Lob fin fish __________ is considered living fossil.

Step-by-step solution

Coelacanth is a lobe-finned fish that was thought to be extinct but was discovered alive in 1938 in South Africa. It has remained largely unchanged for millions of years and is therefore considered a living fossil. Cichlid fish are a diverse family of ray-finned fishes. Seymouria is an extinct genus of amphibian-like tetrapods. Ichthyosaurs are extinct marine reptiles. Answer: Coelacanth