CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Arandaspis prehistoric fish, artwork. This extinct aquatic vertebrate lived in the Ordovician period, about 500 million years ago. Arandaspis was a precursor to true bony fish. It had a streamlined body, reaching 5 centimetres in length, which was covered with knobbly scales. Hard bony plates covered the entire head, with openings for eyes, mouth and gills. Arandaspis lacked a jaw and was thought to feed by sucking in food particles from the bottom of the sea floor.
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