They can give a nasty bite but thats about it, they actually arent spiders as they dont have 8 legs they belong to the scorpion family. They are called Camel Spiders as they live in the desert, the myth is they got their name as they would eat the insides of dead camels but thats all it is a MYTH. And the word I think your after is Reptile Linn and these are not part of the reptile family. Reptiles are snakes/crocs/goannas ect.
p.s Yes I do own every DVD that Nat Geo has ever released and am about 40% of the way through the hundreds that the BBC has released its a bit of a favourite pastime of mine watching Wildlife Docos