Amateur cave explorers in America have found a new family of spiders in southern Oregon that scientists have dubbed Trogloraptor - or cave robber - for its fearsome front claws.
Entomologists at the California Academy of Sciences in San Francisco say the spider evolved so distinctly that it requires its own taxonomic family.
It's the size of a US fifty cent piece, and is the first new spider family from North America since 1870.
The spider spins a crude web, but scientists don't know yet what, or how it eats.
Photo: California Academy of Sciences