Lobe-Finned Fish
Fins are long, fleshy, muscular lobes central core of bones with joints bony rays only at tip of lobed fins
A living fossil: Latimeria, living relative of long-extinct fish, discovered 1938 in Indian Ocean
Lungfish: 6 species in freshwater, swim bladder developed into lung can survive months without water while dug into mud
Evolutionary step towards amphibians