SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY SINCLAIR STAMMERS / SCIENCE PHOTO LIBRARY
Fossil of a crinoid, Actinocrinites gibsoni, being attacked by a starfish, Onycaster flexilis. Crinoids are primitive marine animals related to starfish and sea urchins. They are usually sessile and consist of a stem (not seen here) and a cup- like body (top) which bears ten feathery arms (bottom, surrounding starfish). The central tube being gripped by the starfish is the crinoid's anus. The fossil comes from the lower Carboniferous period (345-325 million years ago) and was found near Crawfordsille, Indiana, USA.
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