Cephalopods were smaller and there were fewer of them than during the Ordovician Period. The Eurypterids or Sea Scorpions, made their first appearance in the Ordovician Period. In the Silurian they became the dominant predator. Eurypterids were arthropods. Arthropods have an exoskeleton and jointed legs. Crabs, insects, and spiders are all arthropods. One of the Sea Scorpions of the Silurian grew to be ten feet long. It was a huge predator that had large claws for snagging its prey.
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