STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Prodacrodus shark teeth fossils. Coloured scanning electron micrograph (SEM). Fossilised teeth from an extinct shark prodacrodus from the late devonian and early carboniferous period. Prodactus belonged to the class chondrichthian a diverse group of cartilaginous fishes that includes the sharks, skates and rays. Few fossilised remains of prehistoric sharks exist because their skeletons were formed of cartilage, a less durable material than bone. Shark teeth are made of a bone-like enamel-coated substance that is more readily fossilised. Some of the ancient sharks reached enormous sizes and had teeth reaching over 17 centimetres in length. Magnification: x80 at 10cm wide.
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