This 2010 photo from a cave outside Grants Pass, Ore., shows a specimen of a new family of spiders, which scientists are calling Cave Robber (Trogloraptor marchingtoni ) for its fearsome claws. Amateur cave explorers sent specimens to the California Academy of Sciences, where scientists decided it was so evolutiionarily different that they had to create a whole new family to put it in. The discovery is described in an article published Friday, Aug. 17, 2012 in the online edition of the journal Zookeys. (AP Photo/Brent McGregor)

Associated Press
This 2010 photo from a cave outside Grants Pass, Ore., shows a specimen of a new family of spiders, which scientists are calling Cave Robber (Trogloraptor marchingtoni ) for its fearsome claws. Amateur cave explorers sent specimens to the California Academy of Sciences, where scientists decided it was so evolutiionarily different that they had to create a whole new family to put it in. The discovery is described in an article published Friday, Aug. 17, 2012 in the online edition of the journal Zookeys. (AP Photo/Brent McGregor)
This 2010 photo from a cave outside Grants Pass, Ore., shows a specimen of a new family of spiders, which scientists are calling Cave Robber (Trogloraptor marchingtoni ) for its fearsome claws. Amateur cave explorers sent specimens to the California Academy of Sciences, where scientists decided it was so evolutiionarily different that they had to create a whole new family to put it in. The discovery is described in an article published Friday, Aug. 17, 2012 in the online edition of the journal Zookeys. (AP Photo/Brent McGregor)
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