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Description: | The test (skeleton) fragments and loose spines show that this sea urchin was broken before it was preserved as a fossil. The test was hemispherical (shaped like half a ball) with the mouth on the flattened lower surface. Hemicidaris lived on the sea floor in an open sea environment where the salinity (salt content) of the sea water was normal. It was a scavenger that fed mainly on bivalve remains. The spines helped it move around and provided protection from predators. | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | fossils natural world | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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