Ceraurus is a genus of cheirurid trilobite of the middle and, much more rarely, the upper Ordovician. They are commonly found in strata of the lower Great Lakes region. These trilobites have eleven thoracic segments, a very small pygidia and long genal and pygidial spines. Ceraurus is quite common in the Ordovician of upstate New York, south-centr...
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http://en.wikipedia.org/wiki/Ceraurus
genus of trilobites (extinct arthropods) found as fossils in rocks of Ordovician period (505 to 438 million years ago) in Europe and North America. ...
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http://www.britannica.com/eb/a-z/c/46
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