
The claw is from a sea scorpion (eurypterid) Jaekelopterus rhenaniae that lived between 460 and 255 million years ago. It is 46 centimetres long, indicating that the sea scorpion to which it belonged was around 2.5 metres (8 feet) long – almost half a metre longer than previous estimates for these arthropods and the largest one ever to have evolved.
Eurypterids are believed to be the extinct aquatic ancestors of scorpions and possibly all arachnids.
http://www.eurekalert.org/pub_releases/2007-11/uob-gfs111907.php







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