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Shark tooth Galeocerdo B
The Radiolaria are a group of eukaryotic organisms. They live in a mutualistic symbiosis with algae. Their skeleton consists of SiO2, and these silicified skeletons can form thick layers of rock. The skeletons of radiolarians are 0.3 to 2 millimeters in size.
Photos or locations for Radiolaria at this site
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