Giant-arthropod
Guides
Eurypteridae
sea scorpions
Eurypteridae is a family of extinct aquatic arthropods known as sea scorpions, representing some of the largest arthropods to have ever lived. These chelicerates inhabited Paleozoic seas from the Silurian to the Permian periods, approximately 467 to 251 million years ago. Members of this family are characterized by their large size, streamlined bodies, and well-developed swimming paddles. Eurypteridae includes the genus Jaekelopterus, which contains the largest known eurypterid species.