Living Fossil The earliest horseshoe crabs were found 450 million years ago as fossils in strata. Many think of them as crabs and crustaceans when in fact they are more related to spiders and scorpions. Under their enormous shell, their bodies also look more like those of spiders.
This Sea Scorpion, an arthropod of the Eurypterid family, was found on the western coast of Australia, near Shark Bay. A living fossil akin to Arthropleura, its ancestors lived upwards of 400 million years ago.
Recently Japan caught a very rare deep ocean shark. This type of shark is very different from what we usually see. It has six gills and the body is like an eel, normally living under 600-1,000 meters deep in ocean. They have very long history of 50 million years, that’s why they are also called living fossil.